Why is ecosystem difficult to define? Scientists disagree about its true meaning.
o It is a synonym for biome.
o It applies to a vast number of areas with many different traits.
o The word comes from complex Greek roots.

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

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.