4. Various species of ammonites are excellent index fossils that mark the Jurassic and Cretaceous periods. What can a scientist conclude about two
separate rock layers that each hold ammonite fossils of the same species?
Do the depths of the rock layers affect this conclusion? Explain your
reasoning.

Will mark you as ! keiko’s teacher was discussing the theory of endosymbiosis. she asked keiko to mark the organelles in the diagram that most closely resembled prokaryotes. which organelles should keiko mark? * the first image is the question and the second image is some information to you answer the !