Carbon Dioxide-Oxygen Cycle

Occurs when producers use CO₂ and

release oxygne. Animals then use

oxygen and release CO₂

Cell Respiration

the process of using oxygen to release

energy from food

Water Cycle

the constant movement of water

Sun

the main engine driving the

water cycle

Evaporation

the process by which liquid water

changes to water vapor

Condensation

the process in which water vapor

changes to liquid water

Precipitation

the process by which water from

clouds falls back to Earth

(rain, snow, sleet, hail)

Proteins

the building blocks of living things

Nitrogen

needed to make protein

Lightning

can change nitrogen gas to a form

living things can use to make protein