Which statement best explains why the level of atp in skeletal muscles changes during exercise?
adenosine and phosphate in atp are destroyed by the muscles.
waste atp accumulates in the blood stream rather than in the muscles.
the mitochondria increases atp production in the muscles.
atp is used for energy faster than it can be produced in the muscles.

Darius is observing a family of geese, which includes a male goose, female goose, and several goslings. when a dog approaches the geese, the male goose hisses at the dog and flaps its wings threateningly. is the behavior of the male goose an example of an adaptation?

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?