Which of the following is the best example of an organism maintaining homeostasis?
a. wolf panting after a chase
b. a spider catching an insect in a web
c. a cricket becoming infected by a virus
d. a mole digging tunnels in the ground

enzyme speed up the reactions

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%