The future of mankind is in our hands.

He said he likes watching gay porn.

Homo erectus is considered one of our ancestors.

He received the letter challenging him to a duel and began preparing for the duel.

Gender roles are an important element in defining individual behavior in society.

His role is to fulfill his responsibilities as a leader.

The Markov process is a part of probability theory and is useful for modeling random phenomena.

Understanding stochastic processes is an important part of statistics.

Homo erectus is considered one of the ancestors of mankind.

Kangaroos and wallabies are an example of parallel evolution.