Answer:
I learned about this in the 8th grade! Let me share with you what I know!!
Natural selection is the process that enables adaptation and speciation by advancing new traits throughout a population of organisms.
Reproduction is at the core of natural selection because that is how genes are passed along to the next generation. However, survival is important; the better an individual survives, the more it will reproduce, and the more its new beneficial trait will be passed along.
More simple way to put it:
Natural selection relies on reproductive advantages.
If a mutation grants a reproductive advantage to its carrier, chances are his genes will be passed on more often to the future generations.
Step-by-step explanation:
Hope this Helps!