Calcareous ooze is an example of
a. terrigenous sediment
b. bio genous sediment
c. hydrogenous sediment
d. both a and b

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

Which best describes a rhinovirus? o a. a virus that causes a common cold o b. a protective shell around a virus o c. a tube the comes off a virus o d. a piece of dna transferred by a virus

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.