Which of the following is a characteristic of a theory?
select one:
a. all of these
b. it explains why something happens
c. it is supported by a large body of scientific evidence
d. it is accepted to be true by many scientists

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

What re the two main phrases of the cell cycle.

Agenus is a taxonomic grouping that identifies a collection of species. when a scientist discovers a new species, how is this species assigned to a genus