Which statement best describes how the information above relates to human activities?
a) human activities have increased volcanic eruptions.
b) overfishing of the world's oceans is leading to the extinction of some fish species.
c) nations of the world can work together to use energy more efficiently.
d) moving to cooler climates will save energy.

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.

Number and variety of living organisms includes genetic, species, and ecological types

Hybrid instruments that play sounds that are part sampled and part synthesized are known as: