Which of the following factors can limit photosynthesis by being either too high or too low? a.
Light
c.
Oxygen
b.
Carbon dioxide
d.
Temperature

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.

In "the man in the water," what was the remarkable occurrence that rosenblatt reported?

Which is not a type of symmetry? a. asymmetryb. radial symmetryc. bilateral symmetryd. lateral symmetry