Column I | Column II | ||
A. | Porifera | P | Metagenesis |
B. | Cnidaria | Q | Flame cells |
C. | Ctenophora | R | Comb Plates |
D. | Platyhelminthes | S | Choanocyte |
A | B | C | D | |
1. | R | Q | S | P |
2. | S | P | R | Q |
3. | P | S | Q | R |
4. | Q | R | P | S |
Parazoa is a taxon at the base of the phylogenetic tree of the animal kingdom and includes the most primitive forms, characterized by not having proper tissues. The phylum/phyla included in this taxon will be:
I. Porifera | II. Cnidaria | III. Ctenophora |
1. | Only I | 2. | Only II and III |
3. | Only I and II | 4. | I, II and III |