Which of the following characterizes the process of trimming an mrna transcript? group of answer choices

the transcript is trimmed to match the length of the protein.
the transcript can be trimmed at both ends.
the transcript can be trimmed at only the 5' end.
the transcript can be trimmed at only the 3' end

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.