Joseph Connell discovered that Balanus barnacles were excluded from the upper intertidal zone by , while Chthalamus barnacles were excluded from the middle intertidal zone by .

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.

Modern whales developed their traits through natural selection what occurs during the process of natural selection

What maintain homeostasis when a persons internal body temperature is 97.5°f