Hydrogen is the most abundant element in the universe.

Transition elements play an important role in chemical reactions.

My grandmother is very kind.

My grandfather is healthy and living a long life.

My great-great-grandmother lived a very long life.

Deuterium is one of the isotopes of hydrogen.

I often eat sausage for breakfast.

He is learning the basics of mathematics.

Fundamental knowledge of mathematics is necessary to solve advanced problems.

We decided to establish a new organization.