What is the natural tendency of molecules to spread from an area of high concentration to an area of low concentration?
A. Vesicle
B. Passive transport
C. Diffusion
D. Active transport

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

What are the formed elements (cell or parts of cell) in blood and what are their functions ?

How are the testes and ovaries similar? a. both produce sex cells. b. both connect internal reproductive organs to the exterior. c. both transport sex cells from their site of production. d. both store mature sex cells.