Most of the food and oxygen in the environment is produced by the action of

1. Saprophytic Bacteria

2. Heterotrophic Bacteria

3. Aerobic protozoans

4. Autotrophic organisms

What do you think would happen if there were an error in copying the DNA before cell division? Include what you think would happen to the proteins that the DNA (genes) codes for.

What happens to the fluid at the bottom of the asthenosphere?

Which is the correct sequence for levels of biological organization within a multicellular organism?

How are bacteria and viruses similar? How are they different?

The similar nature of the flight/wings of insects, birds, pterosaurs, and bats is example of

Which of the following describes a relationship of commensalism? A. Oxpecker birds eat parasitic ticks off the backs of zebras B. The tapeworm latches itself in the intestines of a rat feeding off all the nutrients eaten by the rat C.

What lunar phase is required for a lunar eclipse? A New B Full C Half

In a classic experiment carried out by the biologist Hopkins in the 20th century, 20 young rats were divided into two groups.

There is no evidence indicating that cigarette smoking has skin-aging effects. true or false

Benthos are organisms that live? A. on the surface of water B. throughout the water column C. on the sea floor D. in shallow water