Question

1. Some long bones have red bone marrow. Why?
2. What had happened, if we would not have freely movable joints in our body?
3. Why are bones in birds hollow?
4. Why do birds and fishes have streamlined body?


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Answer 1

Explanation:

1. because of the presence of this red coloured hematopoitic tissue also red blood cells are produced in this bone marrow

2. your body also makes less synovial fluid the stuff that acts like oil to keep your joints move freely. the result your joints may not move as freely as they used to because synovial fluid requires movement to keep your joints loose

3. because birds need light body to fly and hollow bones make their body lighter

4. to cut the pressure of water and air.