Who proposed the $Cosmozoic$ theory?

Oxygen combined with which of the following to form water,carbon dioxide,and other compounds during the early evolution of the Earth?

What was the contribution of the scientist Van Helmont?

Choose the correct option in terms of evolution.

The first life on Earth was ...

Match the following columns:

Column-$I$	Column-$II$
$(X)$ Earth	$(1)$ $20$ billion years
$(Y)$ Universe	$(2)$ $4.5$ billion years
$(Z)$ Non-cellular life	$(3)$ $3.0$ billion years