Pick your answer from: 1. fossils; 2. Heart; 3. animals; 4. bones;

Answer the following question given this paragraph: Despite their hardness and strength, bones can suffer from injury and disease. Bone problems include fractures, osteoarthritis, and rickets. Q: Fractures, rickets, and osteoarthritis all affect what part(s) of the body? A:
Answer:
4.