Selectively permeable membranes allow only certain materials to pass
through them. t/f?

Which flexible structure that supports the nerve cord and led to the backbone

What are two reasons for why a species might disappear from the fossil record?

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service