Tapeworms ______ Clams ______ Mammals _______ Earthworms _______ Round worms ______ Sea urchins _______ Protostome or Deuterostome ?

Tapeworms __ Clams Mammals _ Earthworms _ Round worms Sea urchins ___ Protostome or Deuterostome ?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter28: Invertebrates

Section: Chapter Questions

Problem 8RQ: Cubozoans are polyps medusoids polymorphs sponges

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Concept explainers

Classification of Marine Organisms

Classification is a way of categorizing organisms that enables an easy process of identification of such organisms. All living things are classified by grouping them under specific categories. The grouping is done based on the close relativeness of the organisms. The classification tool requires knowledge of characteristics, differences, and similarities between different organisms.

Question

Tapeworms ______
Clams ______
Mammals _______
Earthworms _______
Round worms ______
Sea urchins _______

Protostome or Deuterostome ?

Expert Solution

Protostome and Deuterostome

Metazoans are classified into protostomia and deuterostomia based on the embryonic development.

Protostome

It consists of a solid ventral cord.
The blastopore develops into a mouth.
It shows determinate cleavage.
The gut forms the anus by itself.

Deuterostomia

It consists of a hollow ventral cord.
The blastopore develops into an anal opening.
It shows indeterminate cleavage.
The gut forms the mouth by itself.

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