a group of ecosystems that share similar climates and organisms a nonrenewable energy source from the remains of organisms from a former geologic age that can be used as fuel |
change in position from one point to another |
frequency, wavelength, and speed of a wave through a medium |
atoms of the same element with different numbers of neutrons |
cell transport that does not require energy (diffusion and osmosis) Organelle that converts digested food into cellular energy |