Which is potentially a pathogen?

a. acid rain

b. toxic chemicals

c. chlorine

d. a virus

Why did Pangaea spread apart into 7 different continents

What determines the specific amino acid

Which is used in selective breeding? a.) natural selection b.) artificial selection c.) survival of the fittest d.) overproduction of offspring

Suppose that 30% of a molecule of DNA is composed of adenine bases (A) and 20% is composed of guanine bases (G). What percentage of cytosine and thymine bases would that same DNA molecule have? Explain your reasoning.

Two natural hazards that are caused by the movement of plates under earths surface are

What are the two zones of an aquifer? a.) capillary fringe and water table b.) zone of saturation and zone of unsaturation c.) zone of aeration and zone of unsaturation d.) zone of unsaturation and water table

The only cytoskeletal fibers not associated with intracellular movement or whole cell locomotion are the

The example of the great barrier reef is used to illustrate A-the insignificance of coral reefs B-the lack of diversity in the ecosystem C-the consequences of increasing acidity D-the problems that too much algae can relate

What is found in the air spaces within soil?

What is the cycle involving the movement of carbon through the environment