7. what lines internal cavities that have no external opening to the body?
o mediastinum
o pericardium
o mucus membranes
light 9
o serous membranes

The answer is Mucus membranes

answer; ///i do believe that the correct answer is (a)///once a

answer: my answer would be a) scheduling workouts with your friend for consistent days and time

explanation:

for me personally i would be much more likely to go to the gym with a friend because i wouldn't want to cancel on them or stand them up.