Answer:
I believe it is An immune cell that defends the body.
Answer: Membrane transport proteins are specific and selective for the molecules they move, and they often use energy to catalyze passage. Also, these proteins transport some nutrients against the concentration gradient, which requires additional energy.
Explanation:
Helpful, because when you clean the beach you are helping the ecosystem and wildlife.
Gas transport is the movement of O₂ and CO₂ between the systemic capillary beds and the pulmonary capillary beds.