Which is an example of a parasite/host relationship in a
freshwater ecosystem?
A. a bank swallow whunts a mayfly
B. a grizzly bear finds shelter in a cave
C. giardia live in a deer's intestnes
D. an insect eats algae

pls help!!!

Pepsin is an enzyme in the stomach that breaks polypeptides into amino acids. pepsin functions best at a ph of around 1.5. what would be the most likely result if the ph of the stomach were increased to 5

Which of the following is a difference between active transport and facilitated diffusion? view available hint(s)which of the following is a difference between active transport and facilitated diffusion? facilitated diffusion can move solutes against a concentration gradient, and active transport cannot.active transport involves transport proteins, and facilitated diffusion does not.facilitated diffusion involves transport proteins, and active transport does not.active transport requires the expenditure of cellular energy, and facilitated diffusion does not.

What enzyme is most important for dna replication and why?