The correct answer is option A, that is, astronomical units.
The astronomical unit refers to a unit of length, roughly the distance from Earth to the Sun. However, that distance changes as Earth orbits the Sun, from an aphelion to a perihelion and back again once a year.
The astronomical unit is utilized mainly for calculating the distances within the Solar system or around other stars.
The human genome density ranges between 12-15 genes per Megabase pairs. This is because humans have approximately 2000 genes in a total of approximately 3 billion base pairs. However, some primitive organisms have an even larger gene density
than humans. An example is bacteria with gene densities ranging between 100 –
500 genes/Mb. Gene density is therefore
not a good characteristic in determining
the complexity of an organism.
The answer is NO. This is because different environments require different adaptations. A desirable trait in one environment may be inconsequential or detrimental in another environment. This is the reason also why evolution is continuous as natural selection acts on traits of a population to ensure desirable traits are retained with changes in the environment in a dynamic world.
