Which happens as part of the convection cycle in Earth's atmosphere? A. hot, denser air rises
B. cold, denser air falls
C. hot, less less dense air falls
D. Cold, less dense air falls

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.