Unicellular organisms consist of one cell only that performs all vital functions including metabolism, excretion, and reproduction. They are responsible for obtaining nutrients, producing energy, and making proteins.
C is correct. the rest is either about food webs or about both food webs and food chains.
Correct choice is " Eating Carbohydrates "
Animals and other organisms access Glucose for cellular respiration, by eating <u>Carbohydrates</u> .
Homeostasis:
<em>The tendency towards a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes</em>
Photosystems 1 and 2 are here