Major events in the eras

Question 1

1) Precambrian Era (lasted 4 billion years)

Answer 1

• first life forms appeared (prokaryotes and bacteria
• appearance of eukaryotes
• appearance of Ediacaran( animals capable of digesting and reproducing

Question 2

2) Paleozoic Era (lasted 300 million years)

Answer 2

• appearance of trees (ferns and horsetails)
• appearance of first amphibians ( life gets out of water)
• Major extinction
• Largest mass extinction

Question 3

3) Mesozoic Era (lasted 185 million years)

Answer 3

• warm climate (appearance of large reptiles and dinosaurs)
• Mass extinction x2
• small birds and mammals
• flowering plants
• dinos disappear

Question 4

4) Cenozoic Era (lasted 65 million years is still happening)

Answer 4

• mammals continue to thrive

- appearance of primates and hominids