Of the 10 trillion cells in the human body, only about 1 trillion of them are Homo sapiens. The other 9 trillion are microbes living in every nook and cranny in and on the body. Nearly all of them are symbiotic, producing what nutritionists call "non-essential" amino acids and fatty acids (which we don't need in our food because microbes make them for us), important co-factors and vitamins, and crowding out or even fighting away pathogens.
The most common microbe by far is an intestinal Archaeon named Methanobrevibacter smithii, the main source of methane in human flatulence (necessary to keep the large intestinal contents moving; a lack of M. smithii can cause fatal levels of constipation). At numbers greater than 1 trillion, there are more M. smithii cells in the human body than there are H. sapiens cells.
I read a quote that was titled "Cheaney's Second Law": "We are not so much human as we are walking, talking bacterial ecosystems."
Water is the most common molecular subsance found in the human body(~98%). and phosphorous is the most abundant element in human body.
The most common machine in the human body are the bones attached to the muscles.
the most known cell in your body is your brain cell.
the most common thing on earth crust as well as in human body is water .
because the mitochondria is the "power house" of the cell and makes energy, the most logical answer to this question is that the digestive tract is the human body part most like the mitochondria.
Muscle Cells.
Water. It makes up about 65% of the human body.
The common way to examine human body is to do inspection, palpation, percussion and auscultation.
calcium
calcium
H2o
The most common and abundant protein is collagen. It makes up about 25% of your body.