Acetylcholine is an important chemical signal in the nervous system. Once aceylcholine is released, it is quickly broken down into other chemicals because of the activity of cholinesterase. Cholinesterase is which of the following? * a lipid
an organelle
an enzyme
a hormone

Look at the picture below . what does this picture represent ?

The distribution of related animals and plants across the world

Which of these is true for bacteria because they are prokaryotic cells? a. they can engulf body cells in order to make memory cells. b. they must invade viruses in order to reproduce. c. they are much larger than eukaryotic body cells. d. they can reproduce on their own outside of other cells.