PLSSS HELPP
The delta phase occurs when

1your brain is completely shut down
2 your brain is multitasking
3 your brain is sleeping
4your brain is reading and learning

3 your brain is sleeping

Explanation:

i hope this helps ;)

yes the first one is correct .

i believe the answer is: b. mr. head had a long, tube-like face with a rounded open jaw and a short depressed nose.

this is because in the un-revised sentence it said that mr. heads face was long and tube-like, and he had a rounded open jaw. this is not a very grammatically correct because of how it seems to drag on with the and, replaced with, with, makes it sound more fluent in the description.