The membrane of the nucleus helps a cell perform which function? A Keep genetic material in one place
B Store energy
C Store water
D Protect against microbial infection

When water freezes, it . contracts expands

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?