3. Autotrophs ...
O A. make their own food
O B. are the base of the
food chain
o C. are primary producers
o D. all of the above

D: all of the above

Explanation:

Autotrophs have photosynthesis so they are like plants they make their food by photosynthesis they are base of the food chain because other animals eat it

the correct answer is D.

Explanation:

Autotrophs make their own food, which also makes them the start of every food chain. Primary producers make their own food so all three answers are correct which makes the answer all of the above.

Proteins

Explanation:

There are proteins in the membrane that have channels for large polar molecules to move into or out of the cell since the plasma membrane is made of a phospholipid bilayer where the inside is non polar. This means large polar molecules need help from proteins to cross the plasma membrane.