Which of the following is true of coral?
a.
it is located in deep sea regions.
b.
it supports few species.
c.
it is a large and complex organism.
d.
it is composed of thousands of individuals.

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 is the identity of the planets?

Which of the follow describes a disadvantage secondary sources have compared to primary sources?