At the checkpoint, it is determined if the sister chromatids are properly attached to the spindle fibers.

During at the near end of the metaphase stage of mitosis, a M Checkpoint occurs to determine if all sister chromatids (two stands of chromatids) are correctly attached or joined together to the spindle fibers that happens at the centromere.

He should put sand around the spill in order to contain it so that it won't spread

Leaves specifically the gas exchange between plants and the environment. while plants undergo photosynthesis, they also partake in cellular respiration. respiration is the process that happens in the leaves of plants.