Papa Bush was the 41st president of the United States.

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

Protozoans are single-celled organisms.

He is an expert in astrophysics, and his research is highly valued around the world.

In this chemistry experiment, we will learn about the dangers of cyanide compounds.

He is a world-famous physicist.

My biological clock is disrupted, and I've been having sleepless nights.

There are many succulent plants in my room.

In organic chemistry, cyclobutane has a structure in which four carbon atoms are bonded in a ring.

He was just looking from a distance while the problem was happening.