Which sentence from "Black Hole Beginnings" contains a cause-and-effect relationship
O More matter mounts up on the outside, increasing the pressure on the inside.
O Instead it is a dramatic melding, or blending, of atoms, called nuclear fusion.
O Each atom has its own tiny center, or nucleus.
O Surrounding each nucleus is an electrical force field.

The map above shows the expansion of the greek empire. which statement best describes the greeks during the 4th century bc? a. greek expansion was stopped by the persian empire. b. the greek empire controlled parts of africa, europe, and asia. c. the greeks were threatened by barbarian tribes in europe. d. greece did not have friendly relations with ancient egypt.