Carbohydrates are called biofuel. Why?

What is the chance of two parents with blood types ab and o producing an offspring with blood type o a.0% b.25% c.75% d.50%

Suppose you could go back in time to interview henri becquerel on the day he discovered radioactivity. from his perspective, write an account of the discovery.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.