Which is an example of using comparative anatomy to study evolutionary relationships? a: comparing and contrasting the dna of two organisms b: studying the digestive system structure in two organisms c: using ancient footprints to learn about an organism’s behaviors d: looking at the development of a fertilized egg of an organism

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 series lists the correct order of steps of binary fission from first to last? sex pilus connects two cells ® plasmid dna is transferred ® complementary dna strands are created ® cells separate live cells bind to degraded cells ® dna is transported across the membrane ® dna is incorporated into recipient's dna virus infects bacterial cell, new viruses are made ® dna is assembled in new virus ® new virus infects another bacterial cell and transfers dna dna is copied ® dna molecules attach to cell membrane ® cell membrane elongates and pinches off ® two identical cells are produced

The structure of cells has changed significantly overtime. what concept explains the presence of mitochondria in cells?