Do you think traits are learned or organisms are simply born with them?

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 was the land like over 500 million years ago? what was under the sea?

According to the cladogram, which organisms have roundworms as a common ancestor?