Fill in the blank to complete each statement. The land that supplies water to a river system is called a___
Pollution from a single, identifiable source is called
source pollution
Pollution that is difficult to link to a particular origin is called source pollution

Which of the following is most important in making the typical seed more resistant to adverse conditions than the typical spore? a) a different type of sporopollenin b) an internal reservoir of liquid water c) integument(s) d) ability to be dispersed e) waxy cuticle

Name the part of the the brain labeled "e".

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has