Fill in the blank below: in a digestive system, digestion takes place outside of the cells in a series of tubes. food enters one opening and food remnants exit out of a different opening. examples of organisms with this type of digestive system include you, dogs, horses, spiders and earthworms.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.