He is an expert in paleozoology and has a deep knowledge about the ecology of dinosaurs.

The Republic of South Africa is located at the southernmost tip of the African continent.

Anthropozoonosis, or animal-derived infectious diseases, have the potential to spread between humans and animals.

He is receiving treatment for obsessive-compulsive disorder.

In mathematics, it is important to examine the parity of numbers.

This metal has very high malleability.

The sexology class is very interesting.

Sex chromosomes play an important role in determining the sex of an organism.

Sex chromosomes play a crucial role in determining the sex of an organism.

We have a responsibility to protect the biodiversity of the Earth.