Which of the following theory of evolution was proposed by Charles Darwin.

The carpus is __________ to the elbow.

Life on earth arose ———-  years ago

Nitrogen cycling is very important in an aquarium.  From where does the nitrogen come – how does it get into the tank?  (Be fairly specific.)

We talked about different things that cause infectious diseases.  What are two types that spread disease, but that are NOT living organisms?

Why is it better to add fish to an aquarium a few at a time, rather than starting with a large group?

About three million years ago the Isthmus of Panama closed, forming a land bridge connecting North and South America. Snapping shrimp collected from water on one side of the isthmus look similar to those on the other side, but they cannot interbreed. What has occurred?

What bone is labeled I?

All reptiles are carnivores.

Which rock layer (A, B, or C) should have fossils with the most carbon-14?