The observation, identification, description, experimental investigation, and theoretical explanation of phenomena is all part of science. Nothing is immune to the scientific process: from charm quarks that haven't existed naturally since the beginning of time to Pluto, recently demoted from planet to dwarf planet. Questions on knowledge about the material and physical aspects of our world are asked and answered here.

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Name two groups of people that are prone to nutrient deficiencies?

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Two groups of people who are prone to nutrient deficiencies are pregnant women and teenagers.

What are the tubes called inside the kidneys?

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The tubes from the kidneys to the bladder are called ureters.