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Problem 1: a. Please mention the main differences in the body cavities of organisms that belong...

Problem 1:

a. Please mention the main differences in the body cavities of organisms that belong to the following phyla: Plathymelminthes, Nemertea, Nematoda and Anellida.

b. Mention the differences between the digestive and excretory systems of animals belonging to the phyla mentioned in question a.

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Answer #1

a. Body cavities are:

Platyhelminthes= Acoelomate

Nematoda= Pseudocelomate

nemertea = Acoelomate( rhynocoel seen)

Anellida= coeolomate

b.

Digestive System Excretory System
platyhelminthes gastrovascular cavity , one opening only flame cells present
Nematoda opening at both end like tube inside a tube via body wall
Annelida opening at both end like tube inside a tube nephrida are present
Nemertea complete one way digestive tract present protonephridia seen

All the best mate. CHEERS!!

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