The process of diffusion requires

A. a concentration gradient

B. none of the above

C. ATP

D. a vesicle

Identify four ways that prokaryotes can differ from one another

A scientist wants to examine a genetic disease in humans. The scientist hypothesizes that the disease can be treated by using gene therapy.

Adult female monkeys from one population breed with male monkeys of a nearby population. The introduction of new alleles into the first populations gene pool is an example of

A small farming community in Texas covers 14 square kilometers. There are 420 individuals who live within the town limits. What is the population density of this community? 0.

Primary producers are organisms that?

What causes nematocysts to discharge?

Why are biologists concerned about the destruction of rainforests?

Mitosis produces which cell type? O haploid O diploid O chromosome gamete

Jason is in middle school and is well below normal height for his age. which hormone might be in short supply in jason's body?

Describe why the San Andreas Fault could cause so much devastation in California.