The circulatory system is responsible for

1. transporting nutrients to various parts of the body

2. fighting off infection

3. transmitting information to different parts of the body

4. movement

Scientists use squid nerve cells in research because the nerve cells of a squid are 1,000 times fatter than those of a human.

African black-bellied seedcracker finches have beaks that are either large or small. only large-beaked birds can crack open hard seeds, and small-beaked birds are more adept at handling small seeds.

Viruses may only be grown A. in sterile, cell-free chemical growth media. B. in living cells. C. at body temperature. D. in darkness.

Which process lead to the greatest variety of genetic combinations?

What system of the earth would a glacier belong to

How are centipedes adapted for a predatory way of life?

A small, dense planet made of rocky and metallic materials are called

What are some sources of oxygen

A longshore current flowing southwards along a coast will primarily transport sediments

How much does an elephant weigh?