During which phase of meiosis do spindle fibers move the sister chromatids to the center of the cells?

The correct answer would be metaphase II.

Meiosis II is the second division of meiosis in which sister chromatids of chromosomes are separated.

It is also divided into four sub-stages:  

Metaphase II is the stage in which chromosomes are aligned at the central axis to form an imaginary line termed as the metaphase plate.

It is followed by anaphase II in which sister chromatids are separated and moved towards opposite poles.

Thus, the correct answer would be metaphase II.

nucleus

would be most reasonable answer tbh

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.