Air pollution occur when harmful substances or gases are released into the air which is harmful to humans, plants and animals.
It is not all human activities that lead to air pollution , some are of natural sources.
The non human activity that lead to air pollution are dust and wildfire, dust occur when a vast land is been swept or blown by wind,volcanic eruption which lead to release of particulate substances,animal digestion I.e digestion of food eaten by animals especially cattle lead to release of methane as waste product which cause air pollution e.t.c
Stomata open in the daytime, when there is an abundance of heat energy from the sun that causes evaporation of water, causing the guard cells to become flaccid, allowing the stomata to open.
The male frog is the one that croaks to signal to a female that it is ready to mate and only male frogs can produce a mating call. Males also croak to warn other males if there close to their territory.
