All cells have

an outer membrane or plasma membrane
cytoplasm
a cell wall
a nucleus
protoplasm
large vacuoles
chloroplasts

How many major plates cover the earth

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.

What are the three groups of atoms that make up amino acids called