The bottom sediment of this lake is mainly composed of sand and mud.

He looked at the palm of his hand and thought about the fate written on it.

He examined the bottom of the box.

He seemed in pain with a stone stuck in his sole.

He has a deep interest in archaeology.

He understands the importance of learning.

He is majoring in psychology.

Gaku is my best friend.

Microorganisms are one of the basic forms of life.

Protists are single-celled organisms that live in water.