Why would it be hard to find the ideal light intensity if the temperature were very hot or cold?

Because photosynthesis wouldn't happen, if it's too hot then it would become denatured and too cold = cells would stop working

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humans, along with other animals and plants, have linear chromosomes that are arranged in pairs within the nucleus of the cell. the only human cells that do not contain pairs of chromosomes are reproductive cells, or gametes, which carry just one copy of each chromosome.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex