Answer:
The phrase "survival of the fittest" is often used to describe the principle of natural selection, which is a fundamental concept in biology. It refers to the idea that in any given population, individuals that are better adapted to their environment are more likely to survive and reproduce than those that are less well adapted. Over time, this can lead to changes in the genetic makeup of a population, as certain traits become more prevalent.
Whether or not this is a "good" mentality to have is a matter of personal opinion. Some people might argue that it is a natural and necessary part of life, while others might see it as promoting a ruthless and competitive mindset. Ultimately, the answer depends on one's perspective and values.