Which type of macromolecule would best be suited for a bodybuilder looking to increase the size of his biceps? * A. Carbohydrates
B. Enzymes
C. Lipids
D. Proteins

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.