A student is dissecting a three-chambered heart. When she discovers that the ventricle has no partitions, she should conclude that the heart belonged to a(n)

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.

List two modern organisms that have pentameral symmetry

What are some possible short and long term medical concerns for crew members on longer space exploration trips