Any change in the heritable traits within a population across generations is A. evolution
B. reproduction
C. generation

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.

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

Match each term to its best definition? sedimentary depositional enviornment