Can someone please help

In picassos masterpeice bulls head which bicycle part makes up the bulls horn

The caves at lascaux were closed in 1963 because a. vandals were destroying the paintings b. the collective breath of the many visitors caused the paintings to corrode c. the weather was destroying the paintings d. the government of france wanted scholars to be able to study the work without distraction

3christians adapted the roman basilica and used it for public worship. where in their churches did they place the altar?