The two factors that affect the gravitational force between two  objects are Mass and Distance.   The mass of the two objects and the distance between them according to Kepler's Law Fg = GMm/d^2. Gravity exerts itself between all bodies in the universe. It is related to the mass of the bodies and the distance between them.
Note: none of these elements exists freely; all are found chemically combined with other elements in compounds. Although there are over 100 elements, only 12 or so are used to make biological materials. Living organisms are built predominantly from non-metal elements.
Oxygen is the most abundant element in the earth's crust and in the body. The body's 43 kilograms of oxygen is found mostly as a component of water, which makes up 70% of total body weight.he table below gives the amount of each chemical element found in the human body, from most to least abundant. For each element, there is the amount in mass units in an averge (70-kilogram) person, the volume of the element, and the length of the side of a cube that would contain that amount of the pure element.