Plants, such as sunflowers, contain specialized receptor cells that respond to light and grow in the direction of a light source. these specialized plant cells exhibit

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.

Plants that have reproductive structures called cones are?

Whay is the following best defines climate