Answer:
1) Complement System, Lymphatic System, and Circulatory System
2)Tonsils can stop germs entering the body through the mouth or the nose. Spleens filter your blood, destroying old and damage red blood cells.
3)Your skin is a waterproof barrier that secretes oil with bacteria-killing properties.
Explanation:
Calcium in milk which is food because we drink it
meiosis.. hoped it helped :]
Answer:
Atoms of the same chemical element do not always have the same mass because, although the number of protons in the nucleus is the same for all atoms of the same element, the number of neutrons is not. Most elements as they occur naturally on earth are mixtures of several isotopes.
Explanation:
