Which of these describes a quantitative observation?
oa) an observation of the phenomenon itself
ob) an observation of the relative size of something
oc) an observation of an effect the phenomenon has
od) an observation that has a number associated with it

Which of the following are false concerning microbes? a. microbes generate oxygen through photosynthesis.b. the primary role of microbes on the planet involves causing disease in animals and humans.c. microbes produce vitamins in the intestines.d. microbes play a role in breaking down waste and decomposing dead organisms.

After fertilization, which type of cellular division is responsible for the growth and development of a complex, multicellular organism?

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.