Well one is the ways that humans use soil affect the soil quality
Alleles are two different forms of a single gene.
Your answer would be... B. The climate on Earth has changed over time.
<span>Allergy-
A medical condition that causes someone to become sick after eating, touching, or breathing something.
Allergen
A substance or object that causes allergies.
Hope this helps!!
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I think it B. but I don't know if its correct or not.
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I see you got this from k12 too.
