Answer:
Hi there!
The chart demonstrates the concept of survival of the fittest because the ticks of the best traits survive. Mutant 2 obviously is not strong enough to survive and reproduce, as they die very quickly. The Mutant #1 are especially good at survival. They have favorable survival traits.
To explain the graph:
We begin at the top, with the parents. The parents have two types of mutants and a normal tick. Mutant #2 produces one offspring which dies. Mutant #1 thrives, has lots of offspring, and doesn't die. The parents go on with usual amounts of reproduction and survival.
This shows that Mutant #1 has the best traits to allow survival