Which of the following happens before a black hole comes into existence?
A Gravity ceases to exist in a certain region of space.
B.
A new star is born at the center of a galaxy.
C
An old star collapses in on itself.
Activat
D
The fabric of spacetime is ripped by a star or planet.

12) several teeth were found in an area of flat land covered with trees and plants. the teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. they found many other shark teeth in this area. however, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. what is the paleontologist's best explanation for why the teeth were found in this area? a) sharks used to live on flat land. b) this area was once covered with salt water. c) this area was once covered with freshwater. d) someone buried the shark teeth deep in the ground.