Answered: The Phyla that first developed a…

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter15: Animal Evolution

Section: Chapter Questions

Problem 8SQ

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The Phyla that first developed a complete digestive system

Sponges

Mollusks

Cnidarians

Ribbon worms

Flatworms

Definition Definition Organ system that helps in the digestion of food by mechanical and biochemical processes. The digestive system breaks down food into simpler components that enable the body to then absorb or transport nutrients. The human digestive system includes the gastrointestinal tract or alimentary canal and the associate glands. The organs of the gastrointestinal tract include the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The associated glands include salivary glands, liver, gallbladder, and pancreas.

Expert Solution

Step 1

The phylum is a level of taxonomic rank above class and below kingdom.

Porifera-sponges.

Cnidaria-jellyfish, corals.

Platyhelminthes- flatworms.

Nematoda-roundworms.

Annelida-segmented worms.

Arthropoda- insects, crustaceans.

Echinodermata- starfish, urchins.

Step 2

Nematodes known as roundworms or true worms are the phylum which first developed a complete digestive system.

As it is not in the options than the correct answer in mollusks which have a complete digestive system in the given phyla.

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