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Which of the following is a correct sequ...

Which of the following is a correct sequence of decreasing order of number of species ?

A

Aves, pisces, reptiles, amphibians, mammals

B

Pisces, aves, reptiles, mammals, amphibians

C

Pisces, mammals, reptiles, amphibians, aves

D

Amphibians, aves, pisces, mammals, reptiles

Text Solution

Verified by Experts

The correct Answer is:
B
Balanoglossus belong to class enteropenusta. In certain cases, the probosics pore does not communicates with the probosics coelom, but terminate blindly, and may send off a narrow tubular diverticulum which opens inot the neurocoel. The proboscis sits in the collar somewhat like an acorn in its cup, a character that has given the name''acorm worm'' to the group.
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