Answer:
The locomotor system is also known as the musculoskeletal system. It is made up of the skeleton, skeletal muscles, ligaments, tendons, joints, cartilage and other connective tissue. These parts work together to allow your body to move.
II. cells reproduce through the process of mitosis
IV. new cells are produced by existing cells.
So II and IV
A compound is always a substance because it's made out of two or more atoms bonded together. Now a substance isn't always a compound because it takes two or more elements to create a compound in a chemical reaction, ans substances can contain only one element. In other words a substance can be constructed of one type of atom. Some substances that aren't compounds are: gold and baking soda.
The answer would be 2,500 kilometers