Which of the following is the most important process specific to land-dwelling plants? a. production of photosynthetic pigment b. conservation of water c. exchange of gas d. presence of cell wall

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.

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line

If there is another new infectious disease somewhere in the world, what do you think canadian officials should do