Answer:
4.6 billion years ago
Explanation:
Answer:
Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula.
Explanation:
hope it becomes helpful to you ☺️☺️
good luck
n the classification of organisms, which is the correct order of ranks?
What is meant by the term "UV"? In your answer, please explain how it
impacts humans and what it has to do with the atmosphere.
Answer:
The term UV stands for Ultraviolet.
Explanation:
Ultraviolet light is a form of electromagnetic radiation which is shorter than that of visible light, but longer than X-rays. This impacts humans because it can provide harmful effects. For example, UV rays can cause premature aging of the skin and signs of sun damage such as wrinkles and leathery skin. They also cause eye problems. However, our atmosphere blocks a lot of the UV rays from the sun which is amazing because if we were every exposed to it, we would die lol
"Ultraviolet light can't be seen by the human eye but is a part of sunlight. It can be harmful to us if we are exposed to it (sunburn!) but it is mostly absorbed by the atmosphere. The presence of UV light in sunlight can be shown by using fluorescing UV-sensitive beads."
Hope that helps!
why is whitefish used to study mitosis
Answer:
The whitefish embryo is a good place to look at mitosis because these cells are rapidly dividing as the fish embryo is growing. ... This is why mitosis is only visible in cells that are dividing, like the whitefish embryo and the onion root tip. Mitosis can take several hours to complete.
Whitefish (typically the embryos or cells of fish species like zebrafish) is commonly used in scientific research, including the study of mitosis, for several reasons.
Zebrafish embryos are transparent, which allows researchers to observe and study cellular processes, including mitosis, under a microscope easily. This transparency enables real-time imaging of cell division without the need for invasive techniques.
Genetic manipulability: Zebrafish are amenable to genetic manipulation techniques, such as gene knockdown or overexpression, which allows researchers to study the effects of specific genes or proteins on mitosis. This genetic manipulability helps to uncover the underlying mechanisms and signaling pathways involved in mitotic processes.
High fecundity: Zebrafish are highly fertile and produce a large number of embryos, making it easier for researchers to obtain a sufficient sample size for their experiments.
Ethical considerations: The use of zebrafish embryos in research carries fewer ethical concerns compared to studies involving mammals. Their use can help reduce the need for more complex and higher-order animal models.
Overall, the unique characteristics and advantages of whitefish, specifically zebrafish, make them a suitable model organism for studying various biological processes, including mitosis.
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True or False: During asexual reproduction, the organism that is produced is genetically identical to the parent organism. (If your answer is false, then correct the statement to make it true.)
True
Hope this helps!
Answer:
True.
Explanation:
Asexual reproduction, the simplest and most primitive method of reproduction, involves a single parent and produces a clone , an organism that is genetically identical to the parent.
pls help me. with the help of diagram describe the structure of stomach
Answer:
The stomach is a muscular organ located on the left side of the upper abdomen. The stomach receives food from the esophagus. As food reaches the end of the esophagus, it enters the stomach through a muscular valve called the lower esophageal sphincter. The stomach secretes acid and enzymes that digest food.
Hope this helps:)
Homeostasis in the body is assocatied with
A. energy
B. cell communication
C. reproduction
D. antibiotics
Albinism in humans can be caused by recessive mutations in different genes that cause a total lack of melanin pigment. A complementation test would be available when two people with albinism mate to produce offspring. If the two people carry mutations in different genes that each cause albinism, what frequency would albinism occur in their children?
Answer:
none (zero frequency)
Explanation:
The complementation test is widely used in genetics for assessing whether two mutations associated with a phenotypic trait represent two different gene variants of the same gene (i.e., two alleles of the same gene) or if they are mutations associated with two different genes. In a recessive trait, the offspring must receive one recessive allele from each parent in order to show the recessive phenotype (in this case, albinism). Moreover, in heterozygous individuals for a trait that exhibits complete dominance, recessive alleles always are masked by dominant alleles. Albinism is a multigenic (polygenic) recessive trait, thereby individuals who carry recessive mutations causing albinism on different genes will have zero probability (none) of having offspring with albinism.
Answer:
albinism frequency ---> 3/4 = 75% = 0.75 of the progeny will be albino.
Explanation:
Available data:
Albinism can be caused by recessive mutations in different genes that cause a total lack of melanin pigment.Two people with albinism mate to produce offspringThe two people carry mutations in different genes that each cause albinismLet us say that genes A and B are involved.
Gene A: AA and Aa individuals will express pigments, while aa individuals will be albinosGene B: BB and Bb individuals express color, while bb are albinos.Cross: two people with albinism that carry the mutation in different genes
Parentals) Aabb x aaBb
Phenotype) Albino both parents
Gametes) Ab, Ab, ab, ab
aB, aB, ab, ab
Punnett square) Ab Ab ab ab
aB AaBb AaBb aaBb aaBb
aB AaBb AaBb aaBb aaBb
ab Aabb Aabb aabb aabb
ab Aabb Aabb aabb aabb
F1) 12/16 will be albino
4/16 will express color
4/16 will be Aabb
4/16 will be aaBb
4/16 will be aabb
12/16 = 3/4 = 75% = 0.75 of the progeny will be albino.
12. How does oxygen in the air get into the blood?
A through the nose b, through the throat
c. through mouth
d. through the tiny capillaries.
13. What will happen to the cells of the body when there is absence of oxygen?
A. The cells will continue to grow and multiply
b. The cells will be inactive
c. The cells will survive
d. The cells will survive
Answer:
12.d
13. b
if we don't get oxygen if will literally strangle our cells
Which 2 statements explain how in Earth worms oxygen system helps provide itself with oxygen
Answer:
i think oxygen from the surrounding is,obtained through the plasma membrane of an earth worm by the process called diffusion
The Punnett square below shows the genotypes of Amelia's parents. R alpha If R represents the dominant gene for straight hair and r represents the recessive gene for curly hair , which statement best explains how Amelia was born with curly hair ?
Answer:
She received 2 recessive genes
Explanation:
Hope this helps
3. Some organisms have traits that help
them survive in certain situations,
while others of the same species do
not. These differences happen by
due to genetic variation through
sexual reproduction,
chance
planning
Through sexual reproduction
Answer:
it is chance
Explanation:
i took the test
What are the tiny blood vessels that are in contact with the cells of the body? | (5 Points)
Answer:
Capillaries
Explanation:
Ladybird is a type of bird.
True
False
Answer: it’s false
Explanation: ladybird is a beetle
Answer:
true answer because lady bird has light bone and flight feadures
Which product is the result of mitosis?
A. two daughter cells
B. two identical nuclei
C. two strands of DNA
D. two sister chromatids
Answer:
Pretty sure that its C im really sorry if I'm wrong
How are gymnosperm seeds and angiosperm seeds different?
Answer:
angiosperms have seeds that are closed within an ovary, gymnosperms have no flowers or fruits, and have unenclosed seeds on the surface of scales or leaves
what is Otis’s gene versions for body color
Answer:
giao
Explanation:
Which climate is most likely found in a low-pressure belt?
A. Rain Forest
B. Rain Shadow
C. Desert
D. Mediterranean
Answer:
A
Explanation:
Answer:
Its desert
Explanation:
Took the quiz.A PE X
What do you think might happen if during anaphase, the
sister chromatids did not separate?
Answer: A. One sisters cell would have more chromosomes than normal.
The other sisters cell would have fewer chromosomes than normal.
Explanation:
If sister chromatids do not split equally during anaphase of mitosis, one sisters cell would have more chromosomes than normal and the other sisters cell would have fewer chromosomes than normal.
Unequal splitting means that sister chromatids do not separate, resulting in both sister chromatids being pulled into the same sisters cell, leaving the other sisters cell without that chromosome altogether.
How .....................................................................................................................
Answer:
how? what do you mean
Explanation:
how what :)gl
Answer:
um how what?
Explanation:
Investigator Sheer is testifying about DNA evidence she found at the crime scene that matches the suspect on trial. The prosecutor asks Investigator Sheer to explain her conclusion that the DNA samples matched.
What would be a good explanation for her to give to the jury?
That at least 10 different points on the two samples matched
That the DNA profile matches someone with the suspect's hair color and skin tone
That she found one point that matched on the two DNA samples
That the DNA samples showed no clear points in common
Answer:
That at least 10 different points on the two samples matched
Explanation:
I would say this because it seems like the most reliable way to explain her conclusion that the DNA samples match.
4 pic 1 word
what is the word?
Answer:
tree
Explanation:
Answer:
Life ?
Explanation:
The bottom right is a weird looking person but yea. Ain't no way that bottom right thingy is a tree !? I thought it was a human with wings
in Ponus sp male cone matured earlier than female cone describ how this species
encures the Success of pollination ?
Answer:
The correct answer is - to produce more pollen grains.
Explanation:
The maturity of the Pinus sp. male cones takes place before the female cones which are due to ensure that there are more pollen grains available. The higher the number of pollen grains is better for surrounding the female cones when it matures.
This helps in pollination to be species-specific rather than pollinate by any other flower. This feature of early maturation result in easy pollination of the Pinus species.
When is S-phase complete?
Answer:
S phase. In S phase, the cell synthesizes a complete copy of the DNA in its nucleus. It also duplicates a microtubule-organizing structure called the centrosome. The centrosomes help separate DNA during M phase.
Answer:
we say that S phase is complete when each chromosome has been duplicated
Explanation:
Which of the following is an unintended consequence of cutting down trees?
A. Cleared land can be used for agriculture.
B. Depleting wooded areas means fewer habitats for forest
organisms.
C. People burn wood for fuel.
O. D. People use wood to build houses
Answer:
B. Depleting wooded areas means fewer habitats for forest organisms
1. The diagram below represents part of Earth's latitude-longitude system
What is the latitude and longitude of point L?*
45°
30°
15° 0°
15° 30° 45°
30°
N
20°
10°
0°
LI
10°
20°
30°
O (A) 5º E 30°N
(B) 5° N 30°E
(C) 5° W 30° S
O (D) 5° S 30°W
Answer:
The answer is option D hopefully this helps
Gas exchange involves the transport of two respiratory gases, oxygen and carbon dioxide. Review how each gas is transported between the atmosphere and the cells of your body by completing this exercise. Drag each statement into the appropriate bin depending on whether it applies to oxygen only, carbon dioxide only, or both oxygen and carbon dioxide.
Answer:
1)required for cellular respiration(Oxygen only)
2) net diffusion from alveoli to lung capillaries(Oxygen only)
3)sometimes transported as bicarbonate(Carbon Dioxide Only)
4)net diffusion from body tissues to blood(Carbon Dioxide Only)
5)net diffusion from lung capillaries to alveoli(Carbon Dioxide Only)
6)waste product of cellular respiration(Carbon Dioxide Only)
7)enters alveoli during inhalation(Both Oxygen and carbon dioxide)
8)transported by hemoglobin(Both Oxygen and carbon dioxide)
Explanation:
Gas exchange is a mechanism that helps the body to get the necessary Oxygen that is required for cellular respiration to take place
There is diffusion of oxygen to capillaries that are present in the lungs from the alveoli.
Gas exchange is a mechanism that is also responsible for the body to get rid of waste such as carbon dioxide,
Question 4 of 10
If you know the mass and volume of an object, what can you calculate?
A. The object's height
B. The object's density
C. The object's temperature
D. The object's length
Answer:
B
Explanation
m/v
Which of the following would be an example of osmosis?
A) the smell of ammonia spreading through the room
B) the shriveling of a small after salt is poured on it
C) water being poured into a glass
D) the absorption of water by a sponge
Answer:
D
Explanation:
An example of osmosis occurs when a sugar solution and water, top, are separated by a semipermeable membrane. The solution's large sugar molecules cannot pass through the membrane into the water. Another good example of osmosis would be dipping a sponge into water, because there is a higher concentration outside, so the water goes in and makes the sponge expand
Answer:
B) the shriveling of a cell after salt is poured on it
Explanation:
During osmosis, water moves from a low concentration to a high concentration. Since the salt is outside the cell membrane, it makes the outside have a higher concentration than the inside of the cell; causing the water to move from the cell and the cell shriveling.
- Which occurrence is the result of the cell cycle in unicellular organisms?
A. cell repair
B. cell growth
C. cell replacement
D. cell reproduction
Answer:
D
Explanation:
Cell reproduction is the result of the cell cycle in unicellular organisms. The correct option is D.
What is cell reproduction?Cells split to produce multiple cells with similar, if not identical, contents. This process is known as cellular reproduction.
Nuclear division during mitosis produces two somatic cells that are genetically identical to the parent cell and have the same genetic complement.
Asexual reproduction in prokaryotes takes the form of cell division in unicellular organisms.
When an organism splits in half, it creates two totally distinct daughter cells, a process known as binary fission. The daughter cells are identical to the parent cells genetically.
Most of the time, Paramecium reproduces asexually via budding, however in poor circumstances, they produce sexually.
Unicellular organisms have a variety of asexual reproduction strategies, including multiple fission, fragmentation, and budding.
Thus, the correct option is D.
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4.
Which of the following major biomes is most similar to that of the tundra biome?
desert
grassland
temperate forest
chaparral
Answer:
desert
Explanation:
they both have plants and animals that need special adaptations to survive there