What caused the oxygen levels in Earth’s atmosphere to increase during the Precambrian time? Choose the correct answer.
Land plants evolved and released oxygen as they grew.
The chemical weathering of granite released large quantities of oxygen.
Oxygen dissolved in the ocean was released by osmosis into the atmosphere.
Cyanobacteria consumed carbon dioxide and released oxygen as a waste product.
Answers
The Precambrian era is said to have taken place during the early years of our planet. During this time, the levels of oxygen in the atmosphere were much greater than they are today.
This level of increased oxygen in the atmosphere is a direct result of the biological processes and the sheer number of certain organisms present in Precambrian-era oceans.
Though the options stated all depict ways in which oxygen entered the atmosphere during the Precambrian era, the increase of oxygen levels is credited to the cyanobacteria.
The cyanobacteria were among the few living organisms present on the Earth during this time. They are small algae that use photosynthesis to sustain themselves.
Photosynthesis is known to produce and release oxygen as a waste product. This and the vast number of cyanobacteria present at the time account for the increase in oxygen levels during this era.
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Related Questions
Help me pls I need this ASAP
Answers
Soil erosion can increase when humans remove trees and other vegetation from an area. What
is this process called?
A. decomposition
B. conservation
Answers
Eutrophication results in the death of trout and other fish as a result of toxic pH levels in the water toxic pH levels in the water A asphyxiation from lack of oxygen asphyxiation from lack of oxygen B toxic levels of mercury in the water toxic levels of mercury in the water C toxic concentrations of salt in the water toxic concentrations of salt in the water D a lack of sufficient minerals in the water
Answers
Answer: A
Explanation:
Which statement described asteroid and comets ?
A. Both asteroids and comets are solids
B. Both asteroids and comets are gaseous
C. Asteroids are solid and comets are gaseous
D.Asteroids are gaseous and comets are solid.
Answers
Yw ;)
A bird flies by moving its wings up and down. Which two systems are most directly responsible for the movement of a bird's wings?
A bird flies by moving its wings up and down. Which two systems are most directly responsible for the movement of a bird's wings?
A.
respiratory and muscular systems
B.
skeletal and digestive systems
C.
respiratory and digestive systems
D.
skeletal and muscular systems
Answers
Answer:
D
Explanation:
skeletal and muscular systems
Can someone help me please TY! NO LINKS PLEASE!!
Answers
Answer:
B
Explanation:
Fossil fuels produce large quantities of carbon dioxide when burned. Carbon emissions trap heat in the atmosphere and lead to climate change.
where and in what form does carbon used in cellular respiration come from?
Answers
Answer:
Comes from carbon in glucose and the oxygen used in cellular respiration
Explanation:
Carbon dioxide is a waste product of cellular respiration
What type of compound is water according to its chemical bonds?
Answers
Explanation:
Water as a Compound and Molecule
A compound forms whenever two or more atoms form chemical bonds with each other. The chemical formula for water is H2O, which means each molecule of water consists of one oxygen atom chemically bonded to two hydrogen atoms. Thus, water is a compound. It's also a molecule, which is any chemical species formed by two or more atoms chemically bonded to each other. The terms "molecule" and "compound" mean the same thing and can be used interchangeably.
Sometimes confusion arises because the definitions of molecule and compound haven't always been so clear-cut. In the past, some schools taught that molecules consisted of atoms bonded via covalent chemical bonds, while compounds were formed via ionic bonds. The hydrogen and oxygen atoms in water are covalently bonded, so under these older definitions, water would be a molecule but not a compound. An example of a compound would be table salt, NaCl. However, as scientists came to understand chemical bonding better, the line between ionic and covalent bonds became fuzzier.
Answer: water is a polar molecule
Explanation: water H2O has two covalent bonds between Oxygen and Hydrogen atoms. Both are non-metals and share outer electrons for forming a covalent bond.
Oxygen has much greater electronegativity and it pulls shared electrons with greater force. So bond is polar and because molecule is V-shaped, Oxygen has permanent
Negative partial charge. Also molecule is polar and makes Hydrogen bonds with other water molecules.
What does it mean to die of "natural causes" or to die of "old age"?
Answers
Explanation:ya que el cuerpo se dessasta por estar en funsionamieto pormucho tiempoc
On the other hand, dying of “old age” is quite similar. It just means someone who is old died from a disease. You can’t actually die of old age. Older people just have a higher chance of getting illnesses than younger people, and possibly dying from it.
I hope that made sense. If it didn’t, I’m sorry there’s no other way for me to explain it properly
What is karotyping and how is it used in science / medical field??
Answers
Answer:
Karotyping is a chromosomal analysis. It can be used to look for diseases caused by irregularities in the chromosomes, such as Down syndrome.
Explanation:
Karotyping is a chromosomal analysis of the chromosomal constitution of the nucleus of a cell, which is equal to the complete chromosomal makeup of a person. The chromosomes of each species have a certain structure both in size, shape and their own band when they are stained in the laboratory. This allows them to be identified as well as to know if all the genetic information is in the correct order. In addition to numerical abnormalities in chromosomes, structural alterations mean that certain chromosomal regions can be duplicated or even absent. This gain or loss of genetic material has highly varied consequences depending on the genes involved. Another type of structural alterations are translocations and inversions. The karyotype can be studied in search of diseases caused by irregularities in the chromosomes, such as Down syndrome. It also helps to identify problems that a baby conceived through assisted reproduction may have when it is born, by extracting the karyotype that is found in the amniotic fluid of the embryo.
4
Select the correct answer.
Jonathan is starting to grow facial hair, his voice is deepening, and he's showing other signs of puberty. Which stage of development is he likely
in?
OA.
middle childhood
OB. late childhood
Ос.
adolescence
OD. young adult
Answers
Answer:
Adolescence
Explanation:
(of a young person) in the process of developing from a child into an adult.
Answer:
adolecents are teenagers and teenagers get puberty
Explanation:
PLEASE HELP FAST NEED FAST =)
3) Select the reasons why global warming might still occur even if greenhouse-gas emissions drastically decrease.
Answers
Answer:
If the emission of greenhouse gases were stopped, global warming would still happen due to the gases that are already in the atmosphere and the constant deforestation.
Explanation:
Greenhouse gases are the biggest creators of global warming. This is because these gases cause holes in the ozone layer, which protects the planet from the sun's rays. These holes cause the sun's rays to reach the earth's surface with greater intensity, promoting global warming.
Trees are able to absorb these gases, decreasing their concentration in the atmosphere and preventing them from degrading the ozone layer. However, the constant deforestation has reduced the number of plants and the remaining amount on the planet cannot cope with the constant emission of these gases. In this case, even if the emissions of greenhouse gases were ended, the amount of these gases in the atmosphere would still be very large. Plants were slow to absorb all these gases, which would not prevent global warming from happening.
Name the type of tissue which forms the major part of the heart and name the
blood vessel which supplies this tissue with oxygen unless it is blocked by heart
disease.
Type of tissue .......................
blood vessel .......................
Answers
aorta
Which of the following answer choices would be a sex chromosome aneuploidy in a human?
Choose 1 answer:
(Choice A)
A
A male gamete has only one Y-chromosome.
(Choice B)
B
A female gamete contains one X chromosome.
(Choice C)
C
A sperm has one X chromosome.
(Choice D)
D
An egg contains two X chromosomes.
Answers
Answer:
c I think it is but it's up you, it could also be D
Answer:
It's D
Explanation:
Solar tracking, or _____, is a plant's growth toward light.
Answers
How can we get liquid water on mars
Answers
Answer:
Through metal tanks with our strongest metal (tungsten)
Explanation:
if we started transfering over many tanks of it through rockets we could start an area that will be filled with the water. to keep the water from changing because of the new climate build a big round roof that is made out of Polycarbonate.
What is a cell?
a. The smallest unit of the atom
b. The smallest unit of life
c. The largest unit of life
d. The smallest unit of a
population
Answers
Answer:
b
Explanation:
How are genetic modification and artificial selection similar?
Both result from human influences.
Both result from natural selection.
Both involve hybridization.
Both involve crossbreeding.
Answers
A. Both result from human influences.
Genetic modification and artificial selection are similar because both these techniques are the result of human influences.
What do you mean by Genetic modification?Genetic modification may be defined as a set of processes derived from organisms whose genetic material (DNA) has been modified in a way that does not occur naturally.
Artificial selection is also defined by human interference and hence desired traits are carried forward that give advantages and high yield productivity to humans.
Therefore, Genetic modification and artificial selection are similar because both these techniques are the result of human influences.
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the phase in the life cycle of a plant that produces spores
Answers
Answer:
Plants have two distinct stages in their lifecycle: the gametophyte stage and the sporophyte stage. After reaching maturity, the diploid sporophyte produces spores by meiosis, which in turn divide by mitosis to produce the haploid gametophyte. The new gametophyte produces gametes, and the cycle continues.
Explanation:
Answer:
plants have multicellular haploid and multicellular diploid stages in their life cycle. Gametes develop in the multicellular haploid gametophyte (from the Greek phyton, “plant”). Fertilization gives rise to a multicellular diploid sporophyte, which produces haploid spores via meiosis.
Hopefully u will satisfy with my answer of ur question..!!Have a nice day ahead dear..!!Please follow me I will follow u back dear..!!Mark on brainleast please..!!why are no squares half shaded (carriers)
Answers
Answer:
I think coz they do not exhibit the trait because it is recessive, but they could pass it on to their offspring if their partner is also a heterozygote.
The main difference between an ecosystem and a community is-
Answers
in an ecosystem, everything works together for everyone to be able to survive in a community everyone just lives together and it`s their choice whether or not they get along
Hope this helps ✨ - Six
Mendel's F, generation of pea plants were heterozygous. What does this mean? A: All the offspring plants would have the recessive trait. B: Half of the offsprings would have the dominant trait, while the other half would have the recessive trait. C: The offspring had two identical alleles for the same gene. D: The plants had two different alleles for the same trait.
Answers
Answer:
Im pretty sure its D:The plants had two different alleles for the same trait.
Explanation:
If the offspring's is heterozygous it would mean thegenotype would be Pp, which means they would have one dominant allele and one recessive allele.
Why do those in forestry need to be able to perform basic operations without the aid of digital technology?
Answers
Answer:
because they are in the middle of no where so they need to know how to do it or they will be screwed
Explanation:
brainliest ????
Your cells have a unique MHC (major histocompatibility complex). Directions for producing MHCs come from _________________.
A. the helper T-cells
B. the thymus
C. inherited DNA
D. the bone marrow
Answers
The directions for generating MHC comes from the option c. inherited DNA. hence, the option c is correct.
What is MHC?The full form is a major histocompatibility complex. It is the genes group that have the proteins code that should be founded on the cell surface which helped the immune system, that recorded in the foreign substance.
So at the time of directing, it produced MHC that came from inherited DNA.
hence, the option c is correct.
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An organism that reproduces using binary fission, a type of asexual reproduction, creates an identical copy of a cell when
Answers
Answer: An organism that reproduces using binary fission, a type of asexual reproduction, creates an identical copy of a cell when the cell's DNA replicates and the cell divides, giving each cell an identical copy of DNA
Answer:
C.
the cell's DNA replicates and the cell divides, giving each cell an identical copy of DNA.
Explanation:
What did Darwin mean when he thought possibly organisms started on the main land, then changed over time?
Answers
Answer:
He reasoned that plants or animals that arrived on the Galapagos Islands faced environmental factors that were different from those on the mainland. Perhaps, the species gradually changed over many generations and became better adapted to the new environment. Evolution.
Explanation:
Bee orchids are flowering plants that look like they have a female bee resting on them. Bee
orchids produce a scent that mimics hormones released by female bees. This scent attracts
male bees that are seeking a mate. When a male bee lands on the orchid, pollen becomes
stuck to the hairs on the body of the bee. The male bee then transfers the pollen to other bee
orchids.
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How has this adaptation given the bee orchids a reproductive advantage?
Answers
Answer:
The adaptation makes the orchids more desirable to bees, and therefore more likely to be able to reproduce than other plants without the adaptation.
Explanation:
in mitosis the two resulting cells are
a. different from the starting cell and identical to each other
b. identical to the staring cell and different from each other
c. different from the staring cell and different from each other
d. identical to the starting cell and identical to each other
Answers
Answer:
D
Explanation:
mitosis creates exact copies of the starting cell
In mitosis the two resulting cells are identical to the starting cell and identical to each other. Therefore, option (D) is correct.
What is mitosis?In cell biology, the cell cycle phase known as mitosis is when replicated chromosomes are divided into two new nuclei. Mitosis, the process of cell division, creates genetically identical cells with a constant number of chromosomes. Thus, equational division is another name for mitosis.
Making additional diploid cells is the goal of mitosis. Each chromosome is copied, and the copies are then distributed to the various sides of the cell. In this method, each new cell receives a copy of each chromosome when the cell splits in half.
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Which of these statements explains why the plants in Groups E and F died? The high sugar content caused too much water to move into the root cells. The high sugar content caused too much water to move into the root cells. The high sugar content clogged the pores in the cell membranes. The high sugar content clogged the pores in the cell membranes. The high sugar content prevented the plant from capturing energy. The high sugar content prevented the plant from capturing energy. The high sugar content caused too much water to move out of the root cells.
Answers
Answer:
The high sugar content caused too much water to move out of the root cells.
Explanation:
Too much causes transpiration to occur, in this case too much water killed the plant.
The statement which explains why the plant in Group E and F died is that the high sugar content caused too much water to move out of the root cells.
What do you mean by High sugar content?
High sugar content in plants may be defined as the amount of carbohydrates (glucose) and their components get accumulated in the different parts of the plants in a high ratio. It also affects the rate of photosynthesis.
High sugar content leads to the loss of water (transpiration) in plants. In this condition, water loss is maximum which results in the scarcity of water in the root cells. And hence the plant died.
Therefore, the statement which explains why the plant in Group E and F died is that the high sugar content caused too much water to move out of the root cells.
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Deserts typically have average daytime temperatures of around 100°F, while the average daytime temperature in tropical rain forests is around 85°F. However, the average monthly temperatures in the desert are lower than the average monthly temperatures in a rain forest. Explain the reason for this difference.
Answers
Answer: The temperature of the rainforest does not experience a drastic fall as in the case of the desert.
Explanation:
In the desert the average daytime temperature remains 100°F and that of the rainforest is 85°F. But average monthly temperatures are lower in the case of desert as compared to the rainforest although the vegetation cover is higher in rainforest as compared to desert so humidity is also more. During night in desert temperature drops to an average of 25°F whereas in rainforest during night temperature level does not drop much it drops to only 71°F. Therefore, the average monthly temperature on desert is lower than rainforest.