At present, stem cell–based therapies are the clinical standard of care for only a few conditions, including leukemia and macular degeneration. Before stem cell therapies can be ethically approved for other conditions, which safety assessments should be confirmed? Choose three correct statements. A. Stem cells should not have harmful mutations. B. Stem cells should not spread beyond the site of the transplant. C. Stem cell treatment should not cause tumors. D. Stem cell treatment should not overrun costs.

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explanation:

oxygen is the first element in group 16 (via) of the periodic table. the periodic table is a chart that shows how chemical elements are related to each other. the elements in group 16 are said to belong to the chalcogen family. other elements in this group include  sulfur, selenium, tellurium,  and  polonium.  the name chalcogen comes from the greek word  chalkos,  meaning "ore." the first two members of the family, oxygen and sulfur, are found in most ores.

oxygen is by far the most abundant element in the earth's crust. nearly half of all the atoms in the earth are oxygen atoms. oxygen also makes up about one-fifth of the earth's atmosphere. nearly 90 percent of the weight of the oceans is due to oxygen. in addition, oxygen is thought to be the third most abundant element in the universe and in the solar system.

activational, i hope this !