Lichens can survive even in harsh environments.

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.

In mathematics, equivalence classes are a very important concept.

Polychaete worms play an important role in the seabed ecosystem.

By regularly checking the key performance indicators, you can understand the performance of the company and devise improvement measures.

Cephalopods are a type of marine life that includes squid and octopus.