Evolution by Natural Selection
Cards (20)
- Approximately how many different species of animals and plants are there on Earth?
- What percentage of all species that have ever lived on Earth are thought to be extinct?
- According to scientists, when did life first develop on Earth?
- What were the first life-forms like?
- What do scientists call the process by which all species of living things have evolved from simple life forms?
- What did the last video cover that is relevant to this one?
- Why do individual rabbits within a population have different characteristics?
- In a population of rabbits, if the environment gets colder, which rabbits are more likely to survive?
- Why are rabbits with thicker fur more likely to reproduce in a colder environment?
- What happens to the alleles for thicker fur over many generations in a colder environment?
- If a fox moves into an area, what trait in rabbits would be most advantageous for survival?
- Why do better eyesight or hearing increase survival rates when a predator is present?
- What happens to the alleles for better eyesight or hearing over many generations when foxes are present?
- What do scientists say has happened when the inherited characteristics of a population change over time?
- What is evolution defined as in the video?
- Through what process does evolution occur, as described in the video?
- What happens when two populations of one species become so different that they can no longer interbreed?
- Why are pygmy rabbits considered a different species from normal-sized rabbits?
- What term is used to describe the process by which new species arise?
- What types of organisms are excluded from the count of nearly 9 million different species of animals and plants on Earth?