Physical change. Boiling water does not change the fundamental properties of the water, as it can turn back into water during condensation.
With shorter necks, giraffe ancestors could not reach food-containing branches on tall trees. This resulted in the directional selection of giraffes with longer necks.
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Why is choosing a direction necessary? </h3>
It nearly appears obvious that the giraffe's long neck developed as a result of a lack of food in the lower branches of trees. The giraffe has a significant advantage because it is taller than any other mammal and can feed where few others can.
When compared to modern giraffes, the giraffe's ancient predecessors had a shorter neck. The plants that were lying at a higher level were inaccessible to them. Giraffe phenotypes have changed in various ways, and now have long necks to reach vegetation that is higher up. The extreme form is chosen above other features in directional selection. It was decided to choose the long-necked giraffe over the short-necked.
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8. Genetic Code is <span>the nucleotide triplets of DNA and RNA molecules that carry genetic information in living cells, which is "language" for the genetic recipe book.</span>
9. No, the RNA has not undergone RNA processing yet. The AAC may be part of an intron--a non-coding sequence of RNA that is removed from the strand before exiting the nucleus and being translated into a protein.
