20
6
hydrogen (H) , oxygen (O) , carbon (C) , nitrogen (N)
16
zero
Six: hydrogen, carbon, oxygen, nitrogen, phosphorus and sulfur.
Someone said it was 4, but don't take my word for it.
Carbon is the most important atom in all living material. It combines with hydrogen, oxygen and nitrogen to produce proteins which are necessary to all living organisms. But of course living organisms need many other elements to form the many compounds necessary to sustain life.
Living organisms share a set of common elements, including carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur. These elements are essential building blocks for biological molecules such as proteins, carbohydrates, lipids, and nucleic acids, which are vital for life processes.
Any link of uranium with the living organisms.
Water is not a living thing, but organisms require it to survive. Water is a Compound of 2 hydrogren elements and 1 oxygen elements.
Iron is unique among the elements because it is essential for many biological processes in living organisms, such as oxygen transport in the blood and energy production in cells.
Organisms composed of many cells are called multicellular organisms.