Through what structure do plant absorb the water they need for photosynthesis a their leaves b their roots c their stems d their stromata

List five ways we are indebted to phytoplankton

Select the correct answer from each drop-down menu. the lac operon in e.coli regulates genes that code for enzymes required for breakdown of lactose. the lac operon is operon that is activated in the presence of .

Polar zones are cold and tend to be dry because of a pressure system of cold. low high