Similar forelimb bones in humans, bats, and horses that perform different functions are called structures and they show evidence of a common .

Tropical rain forests support more species per unit area than any other terrestrial ecosystem. what is one way rain forests are important to the health of the biosphere?

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above

Will give ! ! widentify the advantages and disadvantages of renewable and nonrenewable energy resources.