An earthworm has a heart that moves blood.

What is the main function of this organ?

A. To take in oxygen and remove carbon dioxide

B. To take in and digest food

C. To transport materials to and from body cells

D. To respond to the environment

What are the two layers of the skin? Which layer contains keratinized cells? Which layer contains papillae

Why are rivers less productive than swamps? The water flow n rivers is too high

Why are carbon hydrates important

A man who is homozygous for Huntington's disease and a woman that does not have HD have a child. what is the chance that the child will have HD Show a punter square

Which of the following have been determined as the oldest living tree types on earth? Select all the apply

How would the H-zone in a contracted sarcomere differ from that of a relaxed sarcomere?

Which describes gyres in the northern hemisphere? A.) They move warm water from the surface to the bottom of the ocean. B.) They move cold water from equatorial regions to polar regions. C.

The process of replication is the same for all living things because? A) The structure of the DNA is the same for all living things B) The DNA base pairs can pair up any way they choose C) All living things have the same number of chromosomes D)

You will need to incubate your test wells for 15 minutes twice. Which two of the following describe the conditions under which you will incubate the wells? a. First incubation at 37ºC; second at room temperature. b.

Which is a property of gold?