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Green plants absorb light in their leaves and convert it to energy by photosynthesis.

Food provides energy and nutrients. The different components of our diet have different sources and functions.

Enzymes are proteins that act as biological catalysts, meaning they speed up reactions without being used up.

The human respiratory system is adapted to allow air to pass in and out of the body, and for efficient gas exchange to happen.

The brain and spinal cord form the central nervous system (CNS). The CNS controls and coordinates responses between receptors and effectors.

Learn about hormones and their effect on our body.