identify the signal phrase in the sentence.

carradine explains why nasa has not yet been able to send astronauts to other planets (19).

carradine explains

(19)

nasa has not yet been able to

Based on the cause-and-effect relationship in this sentence, what is the meaning of the word revert? the brownies kali made using a new recipe were too dry, so she reverted to her original recipe. a) to alter or change completely; revise b) to dispose of or remove; to throw away c) to prepare for something; assemble or make d) to go back to a previous state or practice