Looking through a light microscope at a dividing cell, you see two separate groups of chromosomes on opposite ends of the cell. new nuclear envelopes are taking shape around each group. the chromosomes then begin to disappear as they unwind. you arewitnessing

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.

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called