How do membrane proteins contribute to the membrane potential?

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure

What factors contribute to the effect an environmental toxin has on the human body?