Question

*Why did plants and animals live in the sea for so long?
(Ans)-The earliest plants and animals lived in the sea because conditions
on the land were not favourable for life. Initially, there was too little
oxygen in the atmosphere for breathing. Moreover, the ozone layer of
the atmosphere, which prevents harmful UV radiation from the sun
from reaching the ground, had not yet formed. It was only after the
drying of the shallow seas that the first plants adapted to life outside
the water. They started doing photosynthesis, and thus helped in
increasing the oxygen content of the atmosphere and forming the
ozone layer. In the Silurian period, animals resembling scorpions
inhabited the land. Insects, amphibians, and reptiles appeared in
the Devonian and Carboniferous periods. The growth of plants also
increased during this period.
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Answer 1

Answer:

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