Question

2.
The smallest animal phylum is :
(a) Porifera
(9) Annelida
(b) Mollusca
(d) Chordata​

Answer 1

Answer:

(a) porifera

Explanation:

porifera exhibit cellular level and remaining exhibits organ system level of organization

Answer 2

Answer:

The phylum Placozoa has only one species: Trichoplax adhaerans. Can't get much smaller than that. Placozoa is the smallest phylum in the animal kingdon with only one identified species