Serves as a selective barrier for the cell, meaning that it allows some things to pass into or out of the cell but not others.

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

What does natural resource management aim at ?

Which of the following statements about protists are true? a.they are typically found in moist environments. b.they are all unicellular. c.they have a nucleus. d.they are all multicellular.