Why do herbivores need nitrogen?

Dichotomous keys ask

When is a mutated gene most likely to be passed along to offspring over several generations? A. when the mutations are substitutions B. when there are multiple mutations in a gene C. when the mutation is beneficial D. when the mutation is harmful

All of the following are natural cloning except 1. regeneration 2. identical twins 3. dizygotic twins 4. tumor

What does biogeographic isolation lead to

Why do scientists believe that there used to be a single continent, and what was it called?

Hich of mr. helms' vital signs and lab values were abnormal?

Give an everyday example of diffusion in air

Explain why specific restriction enzymes must be used in DNA fingerprinting

Once a basketball has been hit in the air what forces are acting on it

The most important function of the skin is