What do bone marrow and epidermis have in common. a. they are both sites of new cell information b. they both contain structures that assist the body in cooling down if overheating occurs.
c. they both contain or are associated with sensory neorons
d. they are both involved in waste disposal functions*

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.

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

What factors contribute to the effect an environmental toxin has on the human body?