Question

Write two characteristic features of phylum
Platyhelminthes
Cnidaria

Answer 1

Platyhelminthes have the following important characteristics:

• They are triploblastic, acoelomate, and bilaterally symmetrical.

• They may be free-living or parasites. The body has a soft covering with or without cilia.

Answer 2

Answer:

1. animals are bilaterally symmetrical and segmented. they have an open circulatory system. body is divided into head, thorax and abdomen.
2. The flatworms, flat worms, Platyhelminthes, or platyhelminths are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
3. Cnidaria are diploblastic animals; in other words, they have two main cell layers, while more complex animals are triploblasts having three main layers. The two main cell layers of cnidarians form epithelia that are mostly one cell thick, and are attached to a fibrous basement membrane, which they secrete.

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