Who gírl want to be my gírlfriend?​

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.

What would be he the strand of complementary dna produced be the strand of dna shown below> tcg aag

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