Alveolar ventilation remains constant when
the respiratory rate is increased while the volume of air per breath is decreased
the respiratory rate and the volume of air per breath are increased
the respiratory rate is decreased while increasing the volume per breath
both a and c

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the

Other organisms can change their behavior to take the place of the plants in the ecosystem.

The reactants are co_{2} aka carbon dioxide and h_{2}o aka water along with light energy