What is a major source of calcium and sodium in oceans? a. air pollutants b. gases from active volcanoes c. minerals dissolved in aquifers d. weathering and erosion of rocks

What causes darkening of the skin as melanin production increases

Explain why scientists use the word dominant for certain traits.

Energy stored in the bonds that hold together the atoms and molecules of all substances is called a. kinetic energy. b. electrical energy. c. mechanical energy. d. chemical energy.