Bone contains living cells and organic matter such as collagen, protein, and polysaccharides. however, much of the volume of bone is made up of minerals, which may comprise as much as 65% of bone mass. calcium and phosphate are the most common minerals, with calcium in the form of hydroxyapatite and calcium carbonate. magnesium, hydroxide, fluoride and sulfate may also be present. where do you think the body gets the needed minerals?

The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world. it involves making observations, formulating a hypothesis, and conducting scientific experiments.the steps of the scientific method are •observation-the first step of the scientific method involves making an observation about something that interests you•question-once you've made your observation, you must formulate a question about what you have observed. •hypothesis-once you've made your observation, you must formulate a question about what you have observed. •experiment-once you've developed a hypothesis, you must design and conduct an experiment that will test it.•results-the results are where you report what happened in the experiment. •conclusion-the final step of the scientific method is developing a conclusion.i hope that this you : )

A. mitochondrion b. nucleus