Which cell part contains directions for cell growth and reproduction?
a) pores
b) cell wall
c) plasma membrane
d) nucleus

What are two reasons for why a species might disappear from the fossil record?

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

What are the pros and cons of quadrat sampling?