Plant fiber is which type of cell?

collenchyma

parenchyma

sclerenchyma

xylem

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.

Which type of organism is missing from the food web seen in the illustration? primary consumers decomposers primary producers secondary consumers

When plants use sunlight to make food, the energy of sunlight is