During cell division,where are the spindle fibers formed from?

Which one of the following forms the spindle apparatus during cell division?

What is the other name for the structure shown in the given figure?

How many total microtubules are present in the structure of a cilium or a flagellum?

Each centriole has a cartwheel organization having a whorl of tubulin fibrils at the periphery. These peripheral fibrils are composed of how many microtubules?

Centrioles and centrosomes are present in the cells of: