Natural selection in an animal's environments leads to adaptations that change the overall species as a result.
Environment: LandOrganism: RaccoonAdaptation: Human-like hands to open things and eat, dark fur to sneak around.Adaptation type: Physical
Adaptation increases fitness because their grabby hands allow them to find and access food easily and their dark fur allows them to sneak around better.
The genetic variation in raccoons is their coat colors. Some have darker coats while others have lighter, brighter fur. Those with darker fur are able to sneak around better and remain unseen.
OVERPRODUCTION AND THE STRUGGLE TO SURVIVE
Raccoons have 3-7 kits every year. That many kits being born creates competition for food resources. Most make it because raccoons don't have that many natural enemies, but food to scavenge from dwindles and the weaker kits will starve.
Raccoons with darker fur have a better chance of remaining unseen by predators and reproducing. Those with bright fur are more likely to be spotted by predators and not survive.
SURVIVAL AND REPRODUCTION OF THE FITTEST
The raccoons with darker fur will survive and reproduce. This leads to the majority of offspring having darker fur. Raccoons with brighter fur will decrease as a result.