3.) The percentage of cells in each phase or stage can be used as a measure of how long each phase lasts. The cell cycle in onion cells takes 1,440 minutes (24 hours), so if you take the percentage of cells in each
phase and convert it to a decimal figure by dividing by 100 and then multiply the amount of time the cell
cycle takes, you can calculate the approximate time each stage or phase of the cell cycle lasts.
Formula: Duration of phase (in minutes) = percentage/100 X 1,440 minutes

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they deliver oxygen to the blood

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these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.