For almost all organisms on Earth they require sun. The sunlight will be captured as energy.

The process of converting the sun's energy to sugars is called "Photosynthesis"

The sugars are then used by the organism during "Respiration"

Many chemical reactions occur in living organisms.

In order to use many materials and complete chemical reactions "enzymes" are needed.

Enzymes help reactions occur.

There are many enzymes and they all have specific shapes that determine their function.