An element with 13 protons has an atomic mass of 27. Its number of neutrons is

What happens during the heat transfer within earth

List two limitations of natural selection

What can be found in every skeletal muscle? a. nerves, bones, cartilage, and connective tissue b. tendons, cartilage, nerves, and blood vessels c. muscle fibers, nerves, connective tissue, and blood vessels d. tendons, nerves, blood vessels, and bones