All of the following have an internal skeleton except

a. sand dollars.

b. sand fleas.

c. sea stars.

d. sea lilies.

List three natural, nonliving sources of visible light

All the major organs of the body are formed by the week 10 of gestation. which process makes it possible?

Why is it necessary for materials to move into and out of cells

What substance is a reactant, along with oxygen, in cellular respiration? A) fat B) sugar C) water D) carbon dioxide Eliminate

Which animal does not belong to phylum chordata? Alligator Ostrich Octopus Shark

You are studying the source of new virus that has recently infected humans. You suspect that the virus was transferred from other primates (they exhibit a similar infection), specifically chimpanzees, gorillas, or orangutans.

According to the diagram liverworts are

What type of compounds always contain carbon and hydrogen

What is the junction between a nerve cell and another cell called: axon, synapse, dendrite, none of the above

1. Synthesize Information How do you explain to the horse owner why this foal was born with OLWS while two previous foals were perfectly healthy? What would you tell the new parents of the baby girl about their prospects for having more children?