You spot a sea snake while you are in a boat on the Atlantic Ocean and remark about how similar it looks to a snake that lives in Arizona. However, you know that they are most likely separate species due to which of the following reproductive barriers?
a) behavioral isolation
b) gametic isolation
c) habitat isolation
d) temporal isolation

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.

How does friction with the atmosphere affect the speed of an artificial satellite

The ancestors of plants that lived in water had plenty of water for the young. angiosperms are a group of land plants that evolved a reproductive trait for living on land. this trait protect young plants by allowing them to grow only when water is present and the conditions for healthy development are right. what trait most likely young angiosperms in this way?