Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the correct order to form a meaningful and coherent paragraph.

A. This socialising habit may have been an important factor for their brains to grow into a relatively large and complex organ.
B. Unlike many other species, dolphins live in complex social groups.
C. Dolphins are known to be highly intelligent, playful and friendly.
D.Scientists believe that it may have taken thousands of years for Dolphin brains to adapt to survival modes and to develop to their present level of intelligence.

Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the correct order to form a meaningful and coherent paragraph.

A. This socialising habit may have been an important factor for their brains to grow into a relatively large and complex organ.
B. Unlike many other species, dolphins live in complex social groups.
C. Dolphins are known to be highly intelligent, playful and friendly.
D.Scientists believe that it may have taken thousands of years for Dolphin brains to adapt to survival modes and to develop to their present level of intelligence.