If molecules move from one place to another inside of a cell, which type of communication is this? a. intracellular, enzyme-linked receptor or b. intracellular, molecular signal

According to the cladogram, which organisms have roundworms as a common ancestor?

When a person is exercising the body needs to deliver increased amounts of oxygen to the muscles which component of blood ensures that the muscles will receive it

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.