Skull - Protects the brain, Skeletal system - Protects vital organs, Excretory System - Consists of the kidneys, bladder, ureter and urethra., Ligament - Joints bone to bone, Cartilage - Reduced friction at joints, Oviduct - Site of fertilisation, Ovary - Produces eggs, Sperm - The male gamete, Testes - Produce sperm, Uterus - Site of implantation following fertilisation, Zygote - The single cell formed when the nucleus of the sperm and egg fuse, Identical - Twins formed from one egg and one sperm, Non-identical - Twins formed from two eggs and two sperm, Alcohol - A risk to the embryo, Bladder - Stores urine, Kidney - Regulates salt and water levels, Alveoli - Site of gas exchange in the lungs, Tendon - Joins muscle to bone, Ureter - Carries urine from the kidney to the bladder, Urea - Toxic produced removed in the urine,

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