Just as natural selection has shaped the evolution of humans, plants, and all living things on the planet, natural selection shapes viruses, too. Though viruses aren’t technically living – they need a host organism in order to reproduce – they are subject to evolutionary pressures.
Watson and Crick described it well in their published work on DNA and its structure. ... This understanding of the structure of DNA is particularly important because it led to the realisation that if there is an adenine on one side of the pair, then the other base must be thymine.
The rooster and the hen must be homozygous dominant for their phenotypes, in order for their chicks to display both phenotypes.
Rooster= BB (Homozygous dominant for black color)
Hen= WW (Homozygous dominant for white color)
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transport of oxygen</span>. Circulatory system transports oxygen to different parts of the body through red blood cells. Digestion of food is not the right answer because it is the role of the digestive system. The endocrine system facilitates production of hormones and reflex response is made possible by the nervous system, so the last two are also not the right answers.