He is a world-renowned biologist.

He believes in the geocentric theory.

Global warming is a big issue that affects all of us.

A terrestrial planet may have an environment similar to Earth.

He is an expert in geophysics.

We are planning to visit the nature reserve this weekend.

By regularly checking the key performance indicators, you can understand the performance of the company and devise improvement measures.

Cell biology is the study of the structure and function of cells, which are the basic units of life.

We have a responsibility to protect the biodiversity of the Earth.

I am very interested in marine biology.