Front

positively charged particle present in the nucleus of atoms

Back

Proton

Front

when deep, cold water rises from the ocean bottom to the ocean surface

Back

Upwelling

Front

introduction of harmful waste products, chemicals, not native to environment

Back

Pollution

Front

organisms that make their own food (plants, plankton)

Back

Producers

Front

change in organisms over time due to environmental influence or competition

Back

Evolution

Front

close interaction between two or more different species

Back

Symbiosis

Front

tiny organisms that float in ocean currents; most are unicellular and perform photosynthesis

Back

Plankton

Front

negatively charged particles that move about the nucleus in an electron cloud

Back

Electron

Front

characteristic of a material that can be observed or measured without changing the identity of the material

Back

Physical property

Front

organisms that eat producers

Back

Consumers