Astep by step sequence with only one path showing the relationship between organisms that feed on each other starting with a food source such as plants is called what ?

List the advantages and disadavantages of the switch from persistent chlorinated hydrocarbon pesticides (such as ddt) to nonpersistent organophosphate pesicides. have the benefits of the switch outweighed the disadvantages? explain.

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

Abnormal softening of a gland is known as