Which statements describe the fossil record? check all that apply.

there is very little fossil evidence for the first 4 billion years of earth.
there is very little fossil evidence for the last 600 million years of earth.
most of the fossil evidence is from the first 4 billion years of earth.
most of the fossil evidence is from the last 600 million years of earth.
the fossil record is complete.
the fossil record is not complete.

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 is used to keep track of the gamates and possible offsprings combination

Where can a dna be found in a prokaryotic cell