A more thorough explanation:

Definition:

Biological, adj.

1. Related to the study of living organisms and their functions.
2. Related to genetics or inherited traits.

Examples:

• A biologist studies the biological processes of plants and animals.
• Adopted children may search for their biological parents to learn about their genetic background.

Explanation: The first example shows how "biological" can refer to the study of living organisms and their functions. A biologist is someone who studies biology, which is the science of life. The second example shows how "biological" can refer to genetics or inherited traits. Adopted children may want to learn about their biological parents to understand their own genetic makeup.