Biological (adjective)

1. Relating to biology or living organisms.
2. Relating to the study of living organisms and their relationship to each other and their environment.
3. Relating to the processes and functions that occur within living organisms.

Origin:

Mid 19th century: from biology + -ical.

Examples:

1. The study of genetics is a branch of biological science.
2. He was studying the biological effects of pollution.
3. The treatment was a biological therapy.
4. The organism was a biological threat.
5. The Biological Reserve was protected area for endangered animals.