Science Quizzes Biology

Question:
Most fish do not sink in water because of the presence of
I swim bladder
II air bladder
III air sacs
IV air in spongy bones

Option A):
III and IV are correct
Option B):
I and II are correct
Option C):
I, II, III and IV are correct
Option D):
II and III are correct

Correct Answer is Option B):
I and II are correct