Describe three major phyla and their adaptations that separated the branch on the evolutionary tree of...

Describe three major phyla and their adaptations that separated the branch on the evolutionary tree of life.

Expert Solution

1. Phylum Porifera

Sponges are the representative members of this phylum
Water enter them through ostia and exits through osculum
Choanocytes or collar cells line the spongocoel
The sexes are not spearate
The unique feature in them is that they have cellular level of organisation
eg. Sycon, Spongilla

2. Phylum Cnidaria

They have cindoblasts which are present on their tentacles which they use for anchorage and capturing prey
They have a gastro-vascular cavity with an opening (hypostome)
They have two basic body forms: Polyp and Medusa
They have tissue level of organisation
Physalia, Adamsia

3. Phylum Echinodermata

They have an endoskeleton made up of calcareous ossicles
They have water vascular system which helps them in locomotion, capture of food, etc
Fertilization is usually external
They have organ system level of organisation
eg. Asterias, Ophiura

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gladiator answered 2 years ago

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