In which of the following situations does the cell use active transport?

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.

Aragonite shells of clams, snails, or scleractinian corals may be preserved unaltered in cenozoic deposits, but they are generally dissolved or recrystallized in older deposits. true or false

What is not considered a benefit of genetically modified food production? a) faster and more efficient methods of producing hybrids b) introduction of the terminator gene c) the transfer of genetic properties from widely divergent life forms d) the method associated with insect-free crop production