What organelle is labeled K in figure 7-4 and what is the function of this organelle?

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

3differences between bacteria and other 2 cells

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.