(a) Two organs protected by the skeletal system are brain and heart.
(b) Oxygen is a gas supplied by the lungs to the body.
(c) Gases, nutrients and hormones are three things transported by the blood.
(d) Endocrine system produces hormones.
(e) Excretory system gets rid of wastes.
(f) Nervous system controls all the functions of the body.
(g) The movement of a snake is slithering.