List the levels of organization from smallest (least complex) to largest (most complex)

Drag the tiles to the correct boxes to complete the pairs. match each cell organelle with its description.

20 the main source of energy for our planet comes from the

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.