I am majoring in biochemistry at university.

I love organic chemistry classes.

I am majoring in inorganic chemistry at university.

My major is chemical engineering.

Analytical chemistry is a science that reveals the composition and structure of substances.

I am majoring in physical chemistry at university.

Chemical pollution has a serious impact on the health of the Earth.

He is always hanging out with bad friends. Truly, birds of a feather flock together.

I saw a Muscovy duck in the park.

He is suffering from combat stress reaction.