On a molecular level, all organisms
A. show no similarities.
C. have the same bases in DNA and RNA, the same amino acids in proteins, but use different genetic codes.
D. have the same bases in DNA and RNA, but different amino acids in proteins.
E. have the same bases in DNA and RNA, the same amino acids in proteins, and use the same genetic code.
Which of the following statements about natural selection is true?
A. Natural selection leads to increased likelihood of survival for certain individuals based on variation. The variation must come from outside the population.
C. Natural selection causes variations to arise within a population.
D. All individuals within a population have an equal likelihood of survival. Survival is based on chance.
E. Natural selection leads to extinction.
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