A( a protein that is a catalyst for chemical reactions in organisms; it increases the rate of the reaction without being used up or changed.

The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?

Matched chromosomes carrying information about the same characteristics in the organism are called

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.