Answer:
Most ecologists believe that we are in the midst of the sixth mass extinction. Humanity’s impact on nature, they say, is now comparable to the five previous catastrophic events over the past 600 million years, during which up to 95 percent of the planet’s species disappeared. We may very well be. But recent studies have cited extinction rates that are extremely fuzzy and vary wildly.
Explanation:
If a DNA molecule consists of 29% Adenine, how much Thymine will it contain?
Answer: 29%
Explanation: Remember the base pairing rules: adenine always pairs with thymine (in DNA exclusively; in RNA, where there is no thymine, it will pair with uracil), and cytosine with guanine. Because the nitrogenous bases are always paired rationally, they will always be equal in amount.
Minerals are often found in the shapes of crystals.
True
or
False
Answer:
False
I hope this helps!
Please answer this quick I’ll give brainliest
Retina provides a sense of vision.
Select one:
a. False
b. True
PLS HELP, NO IDEA WHAT IT MEANS!!!! What type of reaction will occur when sodium carbonate is added to the pool water to return its pH to the normal range, and what are the typical products of this type of reaction? (4 points)
Answer:
An electrolysis reaction, if the salt is added to the water then it just dissolves. When electricity is run through it, it creates chlorine gas as well as NaOH and hydrogen gas.
Explanation:
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1 How do animals receive their necessary nitrogen?
2. Why can't plants use nitrogen gas directly?
3. Explain why bacteria are essential parts of the nitrogen cycle.
PLZ HELPPPPPPPPP PLZZZZZ
Answer:
the answer is C
HELP ASAP
A landslide is an example of what process?
a. convection
b. mass wasting
c. subduction
d. weathering
Answer: D
Explanation: a land slide is when so much land underneath an area gets sweept away it all starts to slide it can happen in any place on earth thats elevated enough to start one up every biome has a diffrent name for a land slide.
Answer: B- Mass wasting
Explanation: The term "Landslide", is often used as a synonym for mass wasting.
why do we need to know science or the nature of science?
Answer:
A fundamental reason for teaching about the nature of science is to help our students to think for themselves and reach their own explanations and conclusions in ways that consider the scientific dimensions of socio scientific issues
What acid can go through plastic and flooring?
Answer:
Hydrofloride acid
Explanation:
Hydrofluoric acid is a highly corrosive acid, capable of dissolving many materials, especially oxides. Because of its high reactivity toward glass and moderate reactivity toward many metals.
Which of the following are functions of a lipid?
A) Hold genetic information
B) Do most of the jobs in the cell
C) long term energy, insulation and cushion organs
D) short term energy and structure
Answer:
Some of the functions of lipids are to provide long term energy, insulation and cushion organs.
Explanation:
Lipids are biomolecules —predominantly formed by carbon and hydrogen— of great importance to the body, since they are the main component of cell membranes and form part of the structure of necessary organic substances, such as hormones.
Within the functions of lipids are found:
Being a reserve energy source, which can be used in the long term. Body lipids serve as thermal insulators, especially when they are found under the skin. The lipids can cushion the internal organs that they cover, protecting them from trauma by body movement or external trauma.the other options are not correct because:
A. The nucleic acids are the ones that store the genetic information.
B. Lipids are an important component of the cell, but they do not do most of the cell's work.
D. They are not a short-term energy source, like carbohydrates.
Which of the following human actions is LEAST likely to increase soil erosion?
Answer:
tilling
Explanation:
Bobby completed a gym workout today. He focused on his upper body, completing biceps curls, triceps dips, pull-ups, and chest presses.
a. support
b. protection
c. movement
d. communication
Answer:
c
Explanation:
Why is meiosis important for organism
Answer:
Meiosis is called as reduction division and it gives rise to four daughter cells which have only half of the genetic information that was present in the parent cell. Hence, it plays very important role in the formation of gametes (egg and sperm). The gametes are essential in the production of zygote which ultimately develops into a new organism.
Explanation:
16. What type of pollution causes health problems primarily through decreased mental health and stress?
O A. Water pollution
O B. Species extinction
O C. Noise pollution
OD. Acid rain
Answer:
Noise pollution causes health problems primarily through decreased mental health and stress.
1
Which sentences describe how a mutation could result in a heritable change?
Select all of the correct answers.
A protein's structure is altered when it reacts with a foreign chemical.
Exposure to ionized radiation causes a gene sequence to change in an egg cell.
An enzyme's shape and function are modified by exposure to radiation.
A reaction with a foreign chemical causes a change to a gene in a sperm cell.
Answer:
Exposure to ionized radiation causes a gene sequence to change in an egg cell.
Examine the diagram below. The pieces labeled A and T are nitrogenous bases known as
adenine and thymine. What kind of macromolecule is this?
A) Nucleic acid. B)protein. C) lipid D) fatty acid
Will give brainliest
Researchers say that 2,000 bats live in a well. The average wingspan of each bat is seven inches. Imagine that all the bats line up in a straight line, wing to wing. The length of the bats will equal the length of how many soccer fields? Assume that a soccer field is 4,680 inches long.
Answer:
With a wingspan stretching 15 to 16 inches and a total body length of 5 ... Due to its large size and dense fur coat, the hoary bat is also the most hardy, ... The wings of most other bats in Montana are hairless and their ears are long. What's more, “the fast, straight flight of the hoary bat makes it easy to identify on the wing,”
Explanation:
Hope this helps
12. Two teams of scientists hiked 10 kilometers to different study sites. Before their hike, the Valley
team ate a lunch of mostly protein. The Mountain team ate a lunch of a mix of starch and protein, but
hiked at high altitude, where there is much less oxygen. Which team probably had an easier time
hiking?
a
Both teams had an easy time hiking because their digestive systems broke down proteins
into amino acids for cells to release energy.
b
Neither team had an easy time hiking: the Valley team's cells needed more glucose from
broken-down starch for a reaction, and the Mountain team's cells needed more oxygen from
air.
С
The Mountain team had an easier time hiking: their cells released energy from protein
reacting with glucose, which was broken down from starch in the digestive system.
d
The Valley team had an easier time hiking; their cells released energy from protein breaking
down in the digestive system, which then combined with oxygen in cells.
Answer: B. Neither team had an easy time hiking; the Valley team's cells needed more glucose from broken-down starch for a reaction, and the Mountain team's cells needed more oxygen from air.
Explanation:
Before the hiking by the scientists, we are told that the Valley team ate a lunch of mostly protein while the Mountain team ate a lunch of a mix of starch and protein, but hiked at high altitude, where there is much less oxygen.
Based on the above, none of them had an easier time hiking. This is because since the cells of the Valley team who mostly ate protein, need glucose in order for a reaction to occur. For the Mountain team, even though they are a mixture of starch and protein, they went higher which reduced where there was less oxygen. This will have resulted in a hard time for them.
Therefore, neither had a easy time hiking. The correct option is B.
Credibility is essentially the believability of the study, and it is determined by both the trustworthiness and expertise of the researcher. Recently, concerns have arisen over Nalgene drinking bottles and the chemicals they may be releasing into the water. Two scientists publish their findings. One who works for a major Nalgene producing company, the other does not. Which scientist is more credible?
Answer:
The scientist who has no conflict of interest is, in principle, more reliable
Explanation:
All scientific publications must include a Declaration of Interest (also known as Disclosure Statement) by which authors state that there's no personal or financial interest that might be affecting the objectivity of their investigations, results and conclusions. If no conflict exists, the author should indicate that "there is no conflict of interest". In this case, the scientist who works for a Nalgene producing company should state that it is a potential conflict of interest.
how does the microscope shape the world of science especially in biology today?
Answer:
Explanation:
The microscope allowed us to see a whole new world that was not so long ago unknown of even existing to us. We can study normal cells, abnormal cells, a whole microcosmos of one-celled organisms. We now know what organisms cause what diseases and by using a microscope that was all made possible. Today they are used for education and scientific work with finding new organisms and developing a plethora of new cures.
Traditional classifications tended to take into account primarily -
(A.) Extinct organisms
(B.) RNA similarities
(C.) DNA similarities
(D.) Visible similarities and differences
Chloroplasts contain chlorophyll a, chlorophyll b, and carotenoids. Why is this important in the process of photosynthesis? Support your answer with facts.
Answer:
Explanation:
Photosynthesis is the process by which green plants synthesize their food from carbon dioxide and water by using the green pigment chlorophyll generating oxygen as product.
Chlorophyll "a " absorbs light from the orange-red and violet-blue areas of the Electromagnetic spectrum. Also Chlorophyll a transfers energy to the reaction center and donates two excited electrons to the electron transport chain
Its main role is as a primary electron donor in the electron transport chain. So the energy from the sun will ultimately become chemical energy that can be used by the plant for cellular processes.
Chlorophyll "b" absorbs blue light. The main role is to expand the absorption spectrum of organisms.
Plant can absorb more energy from the high frequency blue light part of the spectrum. Its presence in cells helps plant convert a wider range of the energy from the sun into chemical energy.
Carotenoids are usually red, orange, or yellow pigments, and include the compound carotene. These compounds are composed of two small six-carbon rings that are connected by a "chain" of carbon atoms. As a result, they do not dissolve in water, and must be attached to membranes within the cell. Carotenoids cannot transfer sunlight energy directly to the photosynthetic pathway, but must pass their absorbed energy to chlorophyll. For this reason, they are called accessory pigments.
Answer:
The presence of chlorophyll a, chlorophyll b, and carotenoids in chloroplasts allow plants to absorb more energy from sunlight by absorbing multiple wavelengths. Chlorophyll a absorbs blue-violet light and red light. Chlorophyll b absorbs mostly blue light. Carotenoids absorb violet, blue, and blue-green light. The pigments together, therefore, are able to absorb a wider range of wavelengths.
Explanation:
^edge sample answer
the chemical reactants on the left of the following equation produce _____ on the right.
Answer:
ATP
Explanation:
please help i’m stuck
Answer:
its b
Explanation:
is limestone an acid or base
Answer:
it's a base
Explanation:
has pH of 9.9
There are more primary producers than there are ...
A. primary consumers
B. secondary consumers
B. tertiary consumers
C. quaternary consumers
D. all of the above
Answer: the answer is A. primary consumers
Select the correct answer from the drop-down menu.
The fossil in the picture is a trilobite that lived about 500 MYA. So, the age of the rock in the picture is
million years old.
At MOST 500
I use Edmentum an I got it right.
The correct answer is option A i.e. at least 500million years ago.
what are fossils?
Fossils are the preserved remains of plants and animals whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers. Fossils also include any preserved trace of life that is typically more than 10 000 years old.
There are five types of fossils:
Body FossilsMolecular FossilsTrace FossilsCarbon FossilsPseudo fossilsso, this trilobite existed around 500 million years ago and million years ago.it is confirmed that the rock might have been formed way before the trilobite fossil that has been formed. It is needed not that the rock has formed during the formation of fossil itself. So we can safely say that the rock is at least 500 million years ago.
To know more about fossils here
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One argument in response to the "Commons" idea is that private land ownership will prevent a "tragedy" from happening. Based on the article, do you agree or disagree? Why?
Answer: agree
Explanation:
The common argument which is based on shared assets and the behavior of each individuals.
When the land ownership becomes private a tragedy is avoided as each individual treats the land with care and caution, unlike when it’s a common( shared) where they all don’t care what happens to the land or it’s aftermath so far they all gain personally. So yes when it’s a private land then and then do they truly prevent any tragedy associated with common to happen.
How long are X- ray wavelengths compared with ultraviolet wavelengths?
Answer:
Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, that is, in the range 10 nm to 400 nm, corresponding to photon energies from 3 eV to 124 eV (1 eV = 1.6e-19 J; EM radiation with frequencies higher than those of visible
What is the meaning of permeable
Answer:
allowing liquids or gases to pass through it.
Explanation:
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