How can you help prevent muscle injuries

What element does susan b. anthony include in this passage to strengthen her argument?

Astudent is looking through a microscope at some cells of an onion root tip. many of these cells are undergoing division since the root tip grows quickly and requires more cells. which cell most recently underwent metaphase? w x y z

10. in which phase will crossing-over occur? a. mitosis b. metaphase ii c. prophase i d. meiosis ii