Most fish do not sink in water because of the presence of:I. swim bladderII. air bladderIII. air sacsIV. air in spongy bones

Most fish do not sink in water because of the presence of:I. swim blad

1.	Most fish do not sink in water because of the presence of:I. swim bladderII. air bladderIII. air sacsIV. air in spongy bones
A.	and II are correct
B.	I and III are correct
C.	II and IV are correct
D.	, II, III and IV are correct
Answer» B. I and III are correct