Clearly describe the differences between annelids, nematodes, and platyhelminthes.

Expert Solution

Ans- Annelids :

- Segmented/ sectioned bodies, bilateral symmetry.

- Annelids called as segmented worms.

- Habitat- moist soil, fresg water or salt water.

- complete digestive tract with two opening ( mouth and anus).

- They are coelomate- form from coelom ( fluid filled space surrounded by mesoderm ).

- Examples of annelids are earthworm and leeches.

Nematodes :

- Nematodes show bilateral symmetry.

- Nematodes also called as round worms.

- Habitat - wet soil or water.

- Complete digestive tract with two opening ( mouth and anus).

- They are pseudocoelomate- develop from three layers, with space between endoderm and mesoderm called pseudocoelom.

- Examples are hookworms, pinworms etc.

Platyhelminthes :

- They show bilateral symmetry. Their bodies are flat and thin.

- Also called flatworms.

- They are parasitic- live inside a host or water.

- They have only one digestive opening. ( Pharynx).

- They are acoelomate - develop from three layers but have no body cavities.

- Examples are Tapworms, flukes, planaria etc.

gladiator answered 2 years ago

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Question

Clearly describe the differences between annelids, nematodes, and platyhelminthes.

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