मनुष्यों के दांतों का इनेमल (Tooth enamel) मुख्य रूप से निम्नलिखित में से किस यौगिक से बना होता है?

Haversian canals are microscopic structures characteristic of:

Which joint type is found between the vertebral bodies, allowing limited movement?

Which of the following joints is a classic example of a hinge joint in the human body?