Carbon dioxide (CO2) is naturally present in the air in small quantities and is one of the substances produced by the living cells of plants and animals.
(Carbon dioxide; is; naturally present in the air in small quantities) (Carbon dioxide; is; one of the substances) (the substances; produced; by the living cells of plants and animals)
Carbon dioxide Carbon dioxide the substances
is is produced
naturally present in the air in small quantities
one of the substances
by the living cells of plants and animals