In what way can introduced species have deleterious effects on biological communities? i) preying on native species ii) competing with native species for food or light iii) displacing native species iv) competing with native species for space or breeding/nesting habitat

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

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.