The directions for making a protein OPTIONS:
- result in DNA.
- are carried by DNA.
- result in amino acids.
- are carried by amino acids.
A: are carried by DNA.

If two organisms are classified in different orders but are in the same class, which of these statements is true? OPTIONS:
- The organisms have the same genus.
- The organisms are in the same phylum.
- The organisms are in different kingdoms.
- The organisms are members of the same species.
A: The organisms are in the same phylum.

If the number of trees significantly decreases, the atmosphere's level of which gas might significantly increase? OPTIONS:
- nitrogen
- carbon dioxide
- carbon monoxide
- hydrogen
A: carbon dioxide

Which event would most likely result in more food for organisms that are scavengers? OPTIONS:
- Fish die and sink to the bottom of a pond.
- Trees take up and store water with roots.
- Beavers build a new dam and lodge.
- Plants get more sunshine and water.
A:
Fish die and sink to the bottom of a pond.