What are some examples of the survival of the fittest?

Question

Clara Atchley · Accepted Answer

People with Sickle cell anemia and blind fish of Death Valley

Individuals who have sickle cell anemia are best suited to survive in an area where malaria is prevalent. People with one damaged gene for sickle cell anemia have damaged red blood cells that can open up allowing the immune system access to attack the malaria protozoa. These people will survive a malaria infection and are therefore more fit than people with undamaged genes. People without damaged genes for red blood cell production are susceptible to malaria. The protozoa that causes malaria hides inside the red blood cells where the immune system cannot attack it. The only fish that can thrive in the complete darkness of Death Valley's subterranean rivers and lakes are the blind fish. Because they have lost the genes necessary to produce eye tissues, blind fish are better suited to live in environments with complete darkness. While normal fish would run into rocks and risk death from bleeding into a damaged eye, blind fish can run into rocks without suffering damage to their eye tissue because they no longer have the outer, vulnerable eye tissue. These two instances of survival of the fittest are merely two.

Natalie Ahrens · Answer

undefined Some examples of the survival of the fittest include: 
1. Natural selection in species where organisms with advantageous traits are more likely to survive and reproduce.
2. Competition among individuals of the same species for limited resources, such as food, territory, or mates.
3. Predation, where predators prey on weaker or less adapted individuals, resulting in the survival of those with better defenses or camouflage.
4. Environmental changes leading to the extinction of less adaptable species and the proliferation of those better suited to the new conditions.