The smallest unit of an element is composed of the following “sub-atomic particles”. Group of answer choices protium, deuterium, and tritium protons, neutrons, and ions protons, neutrons, and electrons protons, neutrinos, and ions

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

segmented body, an exoskeleton made from chitin, and joint appendages.

friedrich meischer discovered it in white blood cell