Which animal population do scientists frequently study in order to identify specific ways to evaluate the impacts of contaminants on biological communities?
a. bottlenose dolphins
b. giant tortoises
c. mallard ducks
d. swan geese

Apair of fruit flies reproduces and has 1,000 offspring. all 1,000 of the offspring have the alleles gg. what is the most likely combination of alleles for each parent

How dose plate tectonics effect climate

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.