His answer took years to develop. The theory of evolution says that all living things on Earth, including plants, animals and microbes, come from a common ancestor by slowly changing throughout the generations. Darwin suggested that the way living things changed over time is through natural selection
Answer:
They need the basic and most important thing in life which is food shelter and clothing. Thanks. Hope it helps.
The gradual abundance of oxygen (by product of photosynthesis) made it possible for aerobic organisms to grow more and evolve.
Hope that helps!
Likely this was an inversion event.
