M phase, or mitosis.
(You don't need to know this for your course but more properly cell division could also refer to meiosis or binary fission.)
During the day, plants carry out photosynthesis releasing carbon dioxide. During the night, there isn't any sunlight so the plants carry out cellular respiration releasing oxygen.
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The phenomenon validate the Law of Conservation of Energy is "
<span>The light energy travels through the water until it is reflected or absorbed. "</span>