B. DNA.
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Answer:
It contains 2 or 3 ppm of oxygen concentration.
Answer:
During METAPHASE the chromosomes line up along the equatorial plate.
Answer:
D. Artificial Selection.
Explanation:
Normal people can't breed cats by modifying their DNA, so options b and c are eliminated. Breeding cats for specific traits is not natural, so it is not choice a, either. Instead, selective breeding is d. artificial selection.
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