Which of the following choices includes two structures that are found in plant cells, but not in animal cells? chloroplasts, ribosomes
A. lysosomes, mitochondria
B. cell wall, nucleus
C. cell wall. large central vacuole help pls

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.

Long term exposure to waves can cause sunburns and skin cancer.

Which enzymes break down carbohydrates?