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monitta
2 years ago
8

What is the value of 7C2? A. 15 o B. 21 O C. 42 O D. 49 The answer

Biology
1 answer:
VikaD [51]2 years ago
5 0
B) 21:) hope this helps<33
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WILL MARK BRAINLIEST!!Which example is not a biomass energy source?
Vinvika [58]

Answer:

The Sun is not a biomass energy source.

Explanation:

Biomass is plant or animal material used for energy production. The Sun is neither plan nor animal material.  Paper is produced by wood, wood chips also, manure is from animals so all those are a biomass energy source.

5 0
3 years ago
How does making models help scientists observe ...????<br>HELP
olga nikolaevna [1]
Building models doesn't actually help scientists observe phenomena. Scientists build models to describe how nature and systems operate then make observations to see if their models match what they observe. Models which don't match what they observe are either alterated or scrapped. Good models are kept and used by the scientific community.
5 0
3 years ago
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Which of the statements about half-life are true?
Oksana_A [137]

The statements which are true about half-life are given below:

  • A radioactive element's half-life stays the same when its temperature changes.
  • A radioactive element's half-life stays the same when the pressure upon it changes.

Thus, the correct options are B and F.

<h3>What is Half-life?</h3>

The half-life of any radioactive element may be defined as the time taken for the radioactivity of a specified isotope to drop to half of its original value.

The above statement is true about the half-life of any radioactive element because the half-life of any substance does not depend on pressure, temperature, and concentration.

Therefore, it is well described above.

To learn more about Half-life, refer to the link:

brainly.com/question/2320811

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6 0
2 years ago
Whitch statment best compares and contrasts lipids and carbohydrates?
yulyashka [42]

Answer:

The key difference between carbohydrates and lipids is that the carbohydrates are immediate energy sources in living organisms while the lipids act as a long-term energy resource and tend to be utilized at a slower rate. Carbohydrates and lipids are important nutrients in living organisms.

Explanation:

4 0
2 years ago
Whales have vestigial legs. This suggests they _____.
Alex777 [14]
<span> descended from land animals</span>. Scientists believed that whales have evolved 50 million years ago from land dwelling ancestors who feed on fish from nearby sea. According to unearthed fossils, the early whale's body was more adapted to land but its relatives are more suited to live in water.
5 0
3 years ago
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