Which of the following statements is true?
a. elements in the same group have the same number of electron shells.
b. elements in the same period have the same number of valence electrons.
c. elements in the same period have similar characteristics, like reactivity and valence electrons.
d. elements in the same group, or family, have similar characteristics, like reactivity and valence electrons

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

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)

The energy released by a nuclear fusion reaction is produced when