My major is chemical engineering.

Natural numbers start from 0 and continue as 1, 2, 3, 4, 5, 6, 7, 8, 9.

Natural selection plays an important role in the evolution of organisms.

Microorganisms are one of the basic forms of life.

Protists are single-celled organisms that live in water.

I love biology.

I am majoring in biology at university.

I was moved by the beauty of nature.

He is a world-renowned biologist.

Calculating the natural logarithm is an important part of mathematics.