Answer:
(a) No life is known to exist on Venus and Mars because
there the major component of atmosphere is found to be carbon dioxide (i.e., it
constitutes up to 95-97% of atmosphere).
(b) Ozone is an unstable and highly reactive form of oxygen.
Its presence in the troposphere is extremely toxic or corrosive and inhalation
of ozone causes damage to lungs. So, we are lucky that ozone is not stable near
Earth's surface.
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