What forms the backbone of the DNA molecule (the sides of the
ladder)?
A. nitrogenous bases
B. sugar and phosphate groups
C. hydrogen bonds

What is true of all organisms in the kingdoms protista, plantae, fungi, and animalia? a. they are multi-celled. b. they are photosynthetic. c. they have cells that contain membrane-bound organelles. d. they contain cells that lack membrane-bound organelles.

Which mechanism of transport takes place when solute particles move from a region of high concentration to a region of low concentration? active diffusion isotonic osmosis

Why do oceanic plates tend to subduction when colliding with a continental plate