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http://study.com/academy/lesson/what-is-an-organ-system-definition-pictures-quiz.html
Answer:
The answer is B.
Explanation:
When you skin your knee, cells divide to replace old, dead, or damaged cells.
Answer: A food web.
Explanation:
A food web has more diversity because a food chain only shows what each animal eats. A food web,however, shows everything you need to know and more.
Answer:
B. Both DNA and RNA molecules
Explanation:
Both DNA and RNA contain adenine (A) and guanine (G) and, cytosine (C).
But, DNA contains thymine (T), whereas in RNA, it's replaced with uracil (U).
