PLS HELP ASAP TEST Which of the following is an example of an ecosystem?

Choose the correct answer.

a. an oyster

b. a school of fish

c. fish and sharks

d. the open ocean

Ialready know the answers to these questions and they are on the attachment. but i just need to know why that answer is the correct one. plz asap! this is for a report that i need to email by 10!

The mixture of sperm and fluids from the seminal vesicles, prostate gland, and cowper's glands is called

You are studying a protein that you call protein x. there is an aspartic acid at a key position in protein x which is important in the folding and stabilization of that protein. if this aspartic acid is changed to a different amino acid, which type of amino acid substitutions is most likely to allow the protein to fold normally?