Question

Members of phylum porifera are unique among animals because they contain __ distinct tissue layers.

Answer 1

No.

Step-by-step explanation:

The organism are divided into non chordate and chordates depending on whether they have the long rod like structure known as notochord. The non chordates lacks the notochord.

The porifera is included in the phylum non chordata. This is the simplest phylum and shows the cellular level of organisation. The porifera phylum is unique as it has no tissue organization and none of the distinct tissue layer is present in their body.

Thus, the answer is no.

Answer 2

Phylum Porifera contains sponges that have cellular level of organization so the cells in sponges are not organized into specialized tissue, therefore, tissue level of organization is absent in sponges while other animals contain tissue and a higher level of organization.

Therefore, members of Porifera are unique in animals as they contain zero distinct tissue layers due to lack of tissue level of organization.

Sponges contain different cells that performs different function so the cells are specialized in sponges and are organized loosely. Most sponges are asymmetrical and contain pores called Ostia for the passage of water.