What happens at the very end of mitosis? a. sister chromatids separate b. cytokinesis - there are now two cells c. dna replication d. chromosomes align

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.

The cell membrane controls what enters and leaves the cell. which of the structures in the diagram below is the cell membrane? — f о

Which hypothesis most likely explains the results at 60°c and 70°c