How did speciation in darwin's finches occur?
adaptive radiation
convergent evolution
interbreeding
random mating

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

Darrel conducted an experiment with the following procedure: fill two cups with ice water. place an uninflated balloon snuggly onto your left index finger. blow a little air into an identical balloon, and place it onto your right index finger. place both fingers into the cups of ice water. darrel noticed that his right finger felt warmer in the ice water than did his left finger. which of the following does the experiment show? a. air is a good radiator of heat. b. air is a good insulator of heat. c. air is a good conductor of heat. d. air is a good convector of heat.

What did hunter gathers do to alter the environment?