QUESTION: answer this: of what mineral are the hard tissues of the teeth and alveolar bone composed??

ANS: calcium hydroxyapatite

QUESTION: answer this: polar express how many characters did tom hanks play??

ANS: six

QUESTION: answer this: what is the period of revolution of mercury in earth years??

ANS: 88 days

QUESTION: answer this: when did america declare war on germany ww1??

ANS:
1917