I think A is the answer its hard to explain but i hope this helped.
During metaphase 1, the spindle fibers attach to the centromeres of each chromosome. Both kinetochores of each sister chromatid pair are turned toward the same pole. And 2 members of each chromosome pair (sister chromatids) are pulled into each new cell during anaphase 1.
I think the answer you want is they are called chromatids.
I’m pretty sure it’s the refractory period!!
Hope this helps!
A. the runner's muscles have accumulated lactic acid.. I think. 99% sure
