SCIENCE
ZOOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
cnidarian
|
|
|
sponge
|
|
|
mollusk
|
|
|
echinoderm
|
Detailed explanation-1: -Sponges are aquatic invertebrates that make up the phylum Porifera. The word “porifera” means pore-bearing. The phylum is aptly named. As you can see from Figure below, a sponge has a porous body.
Detailed explanation-2: -Porifera and Cnidaria The phylum porifera contains the earliest invertebrates: the sponges.
Detailed explanation-3: -The phylum Porifera comprises the sponges. Sponges are simple invertebrate animals that live in aquatic habitats. Although the majority of sponges are marine, some species live in freshwater lakes and streams. They are found in shallow ocean environments to depths as great as five kilometers (km).
Detailed explanation-4: -Spicules are structural elements found in most sponges. The meshing of many spicules serves as the sponge’s skeleton and thus it provides structural support and potentially defense against predators.
Detailed explanation-5: -The skeletons of sponges (Phylum Porifera) are comprised of collagen, often embedded with small siliceous structures (spicules) arranged in various forms to provide strength and flexibility.