Survival of the fittest is organisms need to reproduce and pass on their genes. This image shows that some guinea pigs suvive and can now pass on and reproduce the next generation.
Karina Jimenez Per. 1
Change in the gene pool is a mutation that leads to a new gene added to the gene pool. This image shows that there is going to be more brown guinea pigs because they're the ones that are going to reproduce the next generation.