Natural Selection and Evolution
Updated: 2/17/2021
Natural Selection and Evolution

Storyboard Text

  • Step 2: Inherited Variation
  • Evolution and Natural SelectionValerie Torrez
  • Step 3: Struggle to Survive
  • What is evolution and natural selection?Evolution is how certain species change and develop over time, whether its their adaptations or body structures. Natural selection is when nature chooses the trait or characteristic that is most "fit" for the present conditions.
  • Step 4: Successful Reproduction
  • The Four Steps of Natural Selection
  • Overproduction is when too many offsprings are produced that the environment cannot support all of them and the offsprings cannot survive.In order for the overproduction to be successful, one of the offsprings has to survive to the point/age that it can reproduce.Here, the ant has produced a lot of offsprings. Sadly, almost all of them have died and only one has survived. The mother has successfully overproduced.
  • Step 1: Overproduction
  • Inherited variation is when each animal/species has its own combination of alleles/traits, despite them being similar/identical. These bears look very similar but are very different due to their parents and traits, as well as their adaptations.
  • Struggle to Survive is the animal's dilemma of trying to stay alive and reproduce in a given environment by competing with other animals for food, dominance over territory, etc.Here, the lion is hunting the zebra for food. The zebra is struggling to survive from the lion due to them trying to prey on them and not being able to outrun them.
  • Successful reproduction is the ability to keep offsprings alive successfully, so when they grow up, they can reproduce and pass on their traits/genes to the next generation(s)In this image, the 3 kittens that are alive/best adapted to the environment are likely to grow up and reproduce, passing down their mom's traits to their offspring, and so forth.