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Explanation:

1)It is better to stick to the lower trophic levels around 2 because it is more consumable.

At the lowest trophic level, there is the lowest consumption of energy. As a result, more people can be fed with the lower trophic levels than the higher trophic levels.

Edit: Sorry forgot to do question 2

2) Different levels in a food web...

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

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.