Question

Which events contributed to life evolving on earth

Answer 1

I believe through 'Natural Selection'. This occurs through the following steps

1) Genetic Variation

2) Over-Production

3) Struggle for existence

4) Survival of the fittest

5) Advantageous characteristics passed on to offspring

Hope this answered your question.

Answer 2

Evolution of life:

The given below are the events that are involved in the evolution of life which includes climate variation, geographical events, major extinction, and changes in the position of the continents.

• 4.6 billion years before, the earth is formed after bombardment with comets.
• 3.8 billion years before, the formation of replicating molecules occurred.
• 3.5 billion years before, the unicellular organisms formed and the photosynthesis started to occur.
• 555 million years before, many marine living animals started to dwell.
• 500 million years before, the vertebrate started to evolve from the invertebrates.
• 450 million years before, the marine lives started to move to lands which are arthropods.
• 420 million years before, the earth landscape started to change.
• 360 million years before, the forest started to appear and four limbed animals started to dwell.

• 248 million years before, the earth's largest extinction took place where 90% of marine lives and 70% of lives living in land has went extinct.
• 225 million years before, the mammals and dinosaurs started to dwell.
• 65 million years before, the dinosaurs went extinct; and bird and mammals survived.
• 4 million years before, many mammals went extinct and ice age began.
• 130,000 years before, cave man started to live and the initiation of modern human took place.