(01.03 MC)
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?
Nucleotides and proteins that form the basis of life were originally carried to
Earth from outer space by comets and meteorites.
O Self-replicating RNA in the early Earth's oceans served as the basis for the DNA
in cells today.
Greenhouse gases in the atmosphere produced amino acids that are used in cells
today.
Photosynthesizing bacteria provided oxygen that formed ozone which protected
DNA from mutating into different forms.
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(01.03 MC)
Scientists have found that all living things. from bacteria to humans, rely on genetic
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