Scientists have found that all living things, from bacteria to humans, rely on genetic codes to direct the functions of their cells. These genetic codes are contained in strings of nucleotides and have very similar structures. Which hypothesis for the origin of life on Earth is supported by this evidence?
a)Self-replicating RNA in the early Earth's oceans served as the basis for the DNA in cells today
b)Nucleotides and proteins that form the basis of life were originally carried to Earth from outer space by comets and meteorites
c)Greenhouse gases in the atmosphere produced amino acids that are used in cells today
d)Photosynthesizing bacteria provided oxygen that formed ozone which protected DNA from mutating into different forms

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