How do all planets orbit the sun? a. triangular orbits
b. nearly circular orbits
c. perfect circles
d. same speed

Why do bacteria thrive even in hostile environments

What are genotypes? what are phenotypes?

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.