Which of the following describes an organelle that both prokaryotic and eukaryotic cells have in common? . -this organelle contains the cell's dna and is where dna replication occurs.. -this organelle is composed of a stack of membrane sacs where proteins are modified and stored.. -this organelle extracts energy stored in glucose molecules to power cell functions.. -this organelle is composed of protein and rna and is used to make proteins for the cell.

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 pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

Acommon kind of mechanical weathering is called