Metagenesis refers to?

Select the Taxon mentioned that represents both marine and freshwater species:

1. Echinoderms

2. Ctenophora

3. Cephalochordata

4. Cnidaria

The figure shows four animals (a), (b), (c) and (d). Select the correct answer with respect to a common characteristic of two of these animals:

(a)		(b)
(c)		(d)

1. (c) and (d) have a true coelom
2. (a) and (d) respire mainly through body wall
3. (b) and (c) show radial symmetry
4. (a) and (b) have cnidoblasts for self-defence

Which of the following pairs are correctly matched? 
 

1. A, C, and D

2, B, C, and D

3. Only A and D

4. Only A and B