Devon has finished reading a peer-reviewed research paper. what is a valid conclusion for devon to reach?

Greenthe fossil record is the history of life recorded byhuman observationgod.climatologists.remains of the past.

Resperation is a way to release carbon back into the atmosphere

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.