What caused the disappearance of land bridges?

A. Volcanic outgassing

B. Shrinking of the polar ice caps

C. Beginning of an ice age

D. A mass extinction

Answer: B

Explanation:

I would say the shrinking of the polar ice caps because in order for ice caps to shrink, they would have to obviously melt. This will cause the sea level and total volume of sea water to rise and cover up the land bridges