DNA is the molecule that carries genetic information of a given organisms. Genetic variation is the changes that occur in the genome of an organisms to help an organism adapt well to the environment, however, they might also be disadvantageous. The variation in DNA sequences are useful in building a tree of life because DNA sequences are similar in closely related organisms and less similar in less closely related organisms.
MRNA, ribsomes,tRNAs, and many enzymatic factors
Starvation.
Disease.
Weather.
Lack of mate.
Offspring dying.
Hunting.<span />
A lot of the energy from photosynthesis flows out as heat.
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When energy is being transported or flowed through the ecosystem most of the heat is lost.
Hope this helps!
