How does oxygen get into the cell in order for cellular respiration to occur? A. Diffusion
B. Exocytosis
C. Osmosis
D. Endocytosis

A. Diffusion

Explanation:

A.Diffusion  - this is correct. Diffusion is the process where small molecules enter the cell by moving from a high concentration to a low concentration through a semi-permeable membrane.

B.Exocytosis  - this is incorrect. Exocytosis is a cell transport mechanism where the cell uses a system of vesicles to transport cargo outside of the cell. The vesicles fuse to the cell membrane and deliver the cargo outside.

C.Osmosis  - this is incorrect, osmosis is a type of diffusion specific to water molecules

D.Endocytosis - this is incorrect. Endoocytosis is a cell transport mechanism where the cell uses a system of vesicles to transport cargo into the cell. The cell membrane engulfs the molecules and brings them into the cell via the vesicle

the answer is definitely c.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons