The two-word name of a species is its name

If a checkpoint detects damaged dna, the checkpoint may

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.

In the diagram below, which organelle is a ribosome, which combines amino acids and produces proteins? оооо