Chromosomes are made of tightly

packed ___molecules.

Respiratory control centers are located in the

Why do some fossils of some extinct organisms have been found while others have not?

Reptiles are closely related to birds. Which of the following characteristics do birds and reptiles share? A. They both form amniotic eggs that are covered by a protective shell. B. They both live their entire lives on land. C.

A forest fire runs through the foothills, its burns and kills all of the shrubs. what effect will the loss of these producers have on the rest of the ecosystem?

Which describes the modern classification system?

What is meant by respiration?

Which directly controls the rate at which food is broken down to ro release energy

a car moves takes fuels and realese energy from gets rids of waste through the exhaust pipe, is car living things? explain your answer

How does changing the proteins produced in a cell alter what an organism does?

To determine the evolutionary relationships among organisms scientist compare what