Why are many of the same genes found in almost all living organisms? (2 points) A: Similar genes arose independently under simil
ar conditions. B: There are limited macromolecules involved in DNA synthesis. C: All living organisms likely originated from a common ancestor. D: Any similarities among genes of different species are due to random chance
Living organisms on Earth show a variety of species due to differences in their genetic material but they also exhibit similarity with each other due to the "conserved DNA sequences" present in them.
It is the conserved DNA sequence in organisms which shows that all organisms have evolved from a common ancestor or they all are the lineages of a common ancestor. For example, DNA of humans shows 98 % similarity to the DNA of chimpanzees which shows that they have evolved from the same common ancestor recently.
C. All living organisms likely originated from a common ancestor ( because all living organisms store genetic information through DNA and RNA. These are linked to a shared ancestry and is how organisms evolve using new genes )
Because you body is introduced to the virus, it is familiar to it and can build up an immunity to the weakened form so when the actual virus invades, your body know what to do.
