Study of living organisms and their interactions with the environment.
All living things need energy. Plants and some bacteria make their own food through a process called photosynthesis, while animals and plants break down this food to release energy in a process called cellular respiration.
Plants use sunlight, water, and carbon dioxide to make glucose (a sugar) and oxygen.
\[ 6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2 \]
Cells break down glucose with oxygen to release energy, carbon dioxide, and water.
\[ C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy} \]
Photosynthesis and respiration are opposite but connected processes that form the basis of life’s energy flow.
Trees absorb carbon dioxide and produce oxygen for us to breathe.
Humans and animals get energy from the food they eat.
Plants make food from sunlight, and both plants and animals turn that food into energy.