Key concepts

What is a cell?

The basic unit of life that makes up all living organisms.

What is homeostasis?

The process by which living organisms regulate their internal environment to maintain stable conditions.

What is metabolism?

The sum of all chemical reactions that occur within a living organism to maintain life.

What are enzymes?

Biological catalysts that speed up chemical reactions in living organisms.

What is photosynthesis?

The process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll.

What is respiration?

The process of breaking down glucose to release energy in cells.

What is a gene?

A segment of DNA that contains the code for a specific trait or function.

What is natural selection?

The process by which individuals with favorable traits are more likely to survive and reproduce.

What are mutations?

Changes in the DNA sequence that can lead to variations in traits.

What is a food chain?

A sequence of organisms each dependent on the next as a source of food.