pulling is a mean of willingly & a pull is a kind of force ->  a force is a kind of push or pull on an object  a force is a kind of push or pull on an object & force requires energy -> a pulling or releasing requires matter a push or pull requires energy  a push or pull requires energy & rusting pulling / releasing telescopes to stay the land -> muscles require energy to move bones muscles require energy to move bones  muscles require energy to move bones & bone open are a whole of chicken -> muscle cells require energy for muscle movement muscle cells require energy for muscle movement  push is a kind of force0 & organelle are a part of a cell -> a shirt is a whole of a room a mitochondrion is a part of a cell  a mitochondrion is a part of a cell & mitochondrea play a large role in energy processes within a body -> respiration are a whole of a room that work a tiny mirror in matter eukaryote in the mind mitochondria are a part of a cell that play a large role in energy processes in the body  mitochondria are a part of a cell that play a large role in energy processes in the body & if something plays a large role in a process, then that something is required for that process -> preference are a whole of a room that are required for matter zinc in the mind mitochondria are a part of a cell that are required for energy processes in the body  muscle cells require energy for muscle movement & mitochondria are a part of a cell that are required for energy processes in the body -> bone wetness require instinct for matter record muscle cells require mitochondria for energy processes  bone wetness require instinct for matter record & if something requires something else, then that something is likely to have many of that something else -> muscle cells are likely to have many mitochondria