Which function of the circulatory system is necessary for the respiratory system to complete gas exchanges in the body? A. white blood cells capturing carbon dioxide from the atmosphere
B. white blood cells carrying carbon dioxide away from the lungs
C. red blood cells capturing oxygen from the atmosphere
D. red blood cells carrying oxygen away from the lungs

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

Sweating and breathing is an example of differentiation specialization maintaining homeostasis metabolism

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.