Which organism appeared on Earth first?

This is short for adenosine diphosphate.

How to ecosystem services affect human sustainability

Why might waves from the same earthquake cause more damage in one area than another?

What is the best metric unit for the height of a flagpole

Which of the following represent the correct order of flow in the water cycle?

How many chromosomes do humans have?

Pairing of homologous chromosomes in prophase of meiosis I appears to be critical for proper alignment, crossing over, and subsequent separation. This pairing is facilitated by the sharing of sequence homology between homologous chromosomes.

What does "leeward" mean?

Which lipid acts as a chemical messenger? a. adipose tissue b. cholesterol c. testosterone d. beeswax

The degradation of alanine yields pyruvate and the degradation of leucine yields acetyl coa. can the degradation of each of these amino acids directly replenish the pool of tca intermediates? explain why or why not.