Trade 50 points for 50 points?

How is a suspension construction made? where is it most commonly used?

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

Which scientist listed below is not one of those to advance the study of mathematics? a. euclid b. herodotus c. pythagoras d.archimedes