survival of the fittest (noun)

1. In the history of evolution, the survival of the fittest played a crucial role in shaping the biodiversity we see today.

2. The concept of survival of the fittest is often explored in science fiction stories where advanced technology creates a dystopian world in which only the strongest can survive.

3. When designing a space, architects often consider the principles of survival of the fittest, ensuring that the materials used are durable and can withstand the environmental challenges.

4. In the fantasy novel, the protagonist goes through a series of challenges and battles, each testing their strength and proving the survival of the fittest.