1. Each statement in key is called

a) couplet.     c) both

b) lead.         d) none

When Rob Dunn began studying the organisms found in human belly buttons, he discovered many different types of bacteria and even a couple of archaeans. Determine if each statement below refers to bacteria, archaeans, both, or neither (match them)

1. Most Closely Related to Eukaryotes

2. Are examples of prokaryotes

3. Commonly found in humans

4. Often found in extreme environments

5. Contain a Nucleus

Each statement describes tetanus, botulism, all, or neither. Label each statement with T=tetanus, B=botulism, A=all, or N=neither.

1. Caused by a member of the genus Clostridium: 2. Endospores found in soil: 3. Contracted by deep puncture wound: 4. Obligate anaerobe: 5. Obligate aerobe: 6. Toxin blocks relaxation pathway: 7. Toxin blocks contraction pathway: 8. Toxin is ingested: 9. Toxin is an endotoxin: 10. Associated with improperly preserved food:

The cardiovascular system has been called the most important system in your body. In the provided discussion thread, defend why you do or do not agree with this statement.