In philosophy, natural law refers to the moral laws of the universe.

The equilibrium length of this spring is 5 centimeters.

He prefers natural foods.

This wood may spontaneously combust if the humidity is high.

His car spontaneously combusted all of a sudden.

Natural rights are rights that humans have from birth.

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

His initial consonant is very distinctive.

Understanding rhymes is a fundamental part of linguistics.

She gave birth to a child as a surrogate mother.