reproduces more successfully than other individuals.
scientists can infer how closely related the organisms are in an evolutionary sense
It's common sense that organisms with similar DNA are more related evolutionary-wise. Analyzing DNA can help us determine which organisms evolved from which organisms.
Movement
'Essential' requires a statement of purpose. If an organism 'wants' as many as possible of its genes preserved in the gene pool, then replication is just what the doctor ordered. But does the cosmos care whether a lineage persists? Probably not. So in that sense, it is not essential that organisms reproduce.
Your skin is not an organism, it is an organ. An organism is comprised of organs and is living (on its own). Organs are groupings of tissue that perform a distinct task. Your skin covers the surface area of you entire body and there is not one organ in your body with that capability. It is based on common sense.
an organism that dies after 5 days of life but leaves 10 offspring, all of whom survive to reproduce
no no no...
scientists can infer how closely related the organisms are in an evolutionary sense
Lol that doesn't even make sense.
It is natural, in the sense that running is something that our evolutionary background prepares us to do.
In one sense it is called a Diploid Organism.
Back when classification was still in its early times, people would arbitrarily choose a certain characteristic on an organism and classify them according to that. This was called artificial classification, as it just relied on external characteristics. For example, Linnaeus's famous system of classification used the sexual organs or plants to classify them, ie, whichever plants had the same looking organs were classified together. Today, the evolutionary classification is more true, in the sense that organisms are actually classified by their evolutionary relationships, and are thus actually related and similar.
It's common sense that organisms with similar DNA are more related evolutionary-wise. Analyzing DNA can help us determine which organisms evolved from which organisms.
civic sense is that sense in an individual which makes him civilized citizen of a country
improved sense of physical and mental well-being
The sense organ that has rods and cones that help you see light and color is the retina.
There may be very little if any change in 500 years. Depending on what happen, sperm from today might be better.