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https://www.sciencelearn.org.nz/resources/1728-the-essential-elements
Scientists believe that about 25 of the known elements are essential to life. Just four of these – carbon (C), oxygen (O), hydrogen (H) and nitrogen (N) – make up about 96% of the human body. These four elements are found in the basic structure of all biochemical molecules.
https://www.livescience.com/3505-chemistry-life-human-body.html
The human body contains 60 chemical elements, but we don’t know what all of them do. 96% of the body is oxygen, carbon, hydrogen and nitrogen.
https://chem.libretexts.org/Bookshelves/General_Chemistry/Book%3A_Chemistry_(Averill_and_Eldredge)/01%3A_Introduction_to_Chemistry/1.8%3A_Essential_Elements_for_Life
Jun 17, 2019 · Note that most living matter consists primarily of the so-called bulk elements: oxygen, carbon, hydrogen, nitrogen, and sulfur—the building blocks of the compounds that constitute our organs and muscles. These five elements also constitute the bulk of our diet; tens of grams per day are required for humans.
https://study.com/academy/lesson/comparing-elements-on-earth-to-those-in-the-human-body.html
Comparing Elements in Earth to Those in the Human Body. When we die, there are traditionally two options: cremation or burial. In the past few years, a third option has come onto the scene: have ...
https://www.diffen.com/difference/Compound_vs_Element
Elements and compounds are pure chemical substances found in nature. The difference between an element and a compound is that an element is a substance made of same type of atoms, whereas a compound is made of different elements in definite proportions. Examples of elements include iron, copper, hydrogen and oxygen.
https://quizlet.com/87723039/chem-chapter-3-chemical-foundations-elements-atoms-and-ions-flash-cards/
Start studying Chem Chapter 3 Chemical Foundations: Elements, Atoms, and Ions. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
https://www.edplace.com/worksheet_info/science/keystage3/year8/topic/753/2881/compounds
The Periodic Table is composed of over a hundred elements and when these elements combine they form compounds. This means that there are billions of possible compounds in existence. A compound is made of two or more elements chemically joined together. ... Bacteria in the Human Digestive ... TRY WORKSHEET FOR FREE. How the Digestive Enzymes Work.
https://www.quora.com/Which-element-is-the-most-important-for-human-survival
Humans are conclusively, utterly, and hopelessly dependent on all of the common elements. Let's see how this is: In its essence the human body is, just like all complex life forms on earth, a metabolically active bag of salty water. * Carbon, ...
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