Going by the passage about bird food and bird watching, which is noted by Dr. Elsa Birde, a possible reason why there might be an <span>the increase in songbirds at the freeders is the addition of dried apples and raisins to the formula.</span>
Answer:
whats the rest of the question?
Explanation:
Cell transport is movement of materials across cell membranes. Cell transport includes passive and active transport. Passive transport does not require energy whereas active transport requires energy to proceed. Passive transport proceeds through diffusion, facilitated diffusion and osmosis. The purpose of the transport proteins is to protect the cell's internal environment and to keep its balance of salts, nutrients, and proteins within a range that keeps the cell and the organism alive.
