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

Will you marry me?

"Do you want to have a meal? Take a bath? Or choose me?" she said jokingly.

She used to be a prostitute, but now she has started a new life.

He was hiding the fact that he was an illegitimate child.

I'm sorry, but I don't speak Japanese.

I'm a Muslim, so I fast during Ramadan.

I'm Jewish.

Stoichiometry is a method for calculating the amount of substances in a chemical reaction.

Chemotransmitters play an important role in the transmission of information between nerve cells.