Why do plants need the element nitrogen

What is the difference betwween enteropeptidase and enterokinase.

Why not all rocks follow the same path

In which motions are the distance and the displacement the same? A. A dog chases its tail in a circle four times B. A bird flies from its nest to the ground and back to its nest. C. A worm moves 5 cm along a straight crack in a sidewalk. D.

jill has a beaker. in this beaker there are two layers. the top layer is transparent with yellow tint to it, and the bottom layer is transparent and clear. jill decides that the bottom layer is probably water.

A reactant that fits into the active site of an enzyme is called?

True or False: Volcanic activity was more frequent in earth's past than it is today. True False

What do all fossil fuels have in common?

In a food chain, biomagnification is the result of

Define and give 2 examples of haploid cells

Explain why a thermocline exists in both temperate and tropical ocean but not in polar oceans