Which provides evidence for the theory that earth's life forms evolved from a common ancestor?
a. the same four nucleic acids are found in the dna of all living organisms.
b. living organisms may store their dna in the cell nucleus, organelles, or cytoplasm.
c. when a virus infects a living organism, the viral rna is integrated into the host's dna.
d) most living organisms' dna has a double helix structure, but some bacteria have circular dna.
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