Competence, relatedness, and autonomy are examples of
1) extrinsic motivation.
2) intrinsic motivation.
3) environmental stimuli.
4) drive reduction.

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 distribution of related animals and plants across the world

Regarding most of the narrator’s story, which word best describes the tone?