Why is the probability of Dd equal to 2pq?

Which number represents a basic ph, 4 or 9? numerical answers expected! answer for blank 1: i'll give

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.

Which statement best describes the first stage of cellular respiration? check all that apply