Q: What does cartilage lack compared to bones, making it softer and less rigid?


Read this paragraph and choose the correct option from the provided answers:

Skeletons made of cartilage rather than bone. Cartilage is supportive tissue that does not have as much calcium as bones, which makes bones rigid. Cartilage is softer and more flexible than bone.

 Choices:

- potassium

- magnesium

- protein

- calcium


A:
calcium