Sharks feed at or near the tops of their food webs and remove sick or injured animals from their ecosystem. Without this ecosystem service, oceans would be full of dead or dying animals. Sharks also influence the feeding habits of other animals to help keep the oceans clean. Because of these ecosystem services sharks are considered:

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.

what tree

explanation:

answerdendrites; blank(2) axons;