1In which era did backboned water animals such as fish develop?
2Write the difference between the Palaeozoic Era and the Cenozoic Era.
3Give the reason: the Mesozoic Era is called the Age of conifers.
4Give the reason: life came into being only long after the earth was formed.
5Which era is called unfavourable to the beginning of life, and why? Explain with an example.
6When did the mammoth with its huge tusks, and the sea fish with lungs, come into being?
7Write the name of the era in which each of these came into being: tree, fern, tusked wild pig, dinosaur, frog, monocot plant, bacterium, mosquito, trilobite, jellyfish.
8In which era did dinosaurs come into being, and in which era were they destroyed?
9What were the causes of the destruction of the dinosaurs?
10If living things such as the dinosaurs were still alive today, what effect would there have been on the balance of nature?
11What is the geological time scale? Make clear the relation between an eon and an era.
12What happened in each of the three eras of the Cryptozoic Eon? Write in short.
13Where did the heavy and the light elements end up as the earth cooled, and what was the result?
14Write the main stages of human development within the Cenozoic Era, with their times.