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The two more distantly related phyla are...

The two more distantly related phyla are

A

Cnidarians and Platyhelminthes

B

Annelida and Arthropoda

C

Chordata and Echinodermata

D

Mollusca and Echinodermata.

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The correct Answer is:
To determine the two most distantly related phyla, we can follow these steps: ### Step 1: Understand the Classification of Animal Kingdom The animal kingdom is divided into various phyla based on certain characteristics. The two main groups are: - **Caudata (Chordates)**: These organisms have a notochord at some stage of their development. - **Non-Caudata (Non-Chordates)**: These organisms do not have a notochord. ### Step 2: Identify the Given Phyla From the question, we need to analyze the provided phyla: - **Caudata** (e.g., mammals, birds, reptiles) - **Echinodermata** (e.g., starfish, sea urchins) - **Cnidaria** (e.g., jellyfish, corals) - **Platyhelminthes** (e.g., flatworms) - **Annelida** (e.g., segmented worms) - **Arthropoda** (e.g., insects, arachnids) - **Mollusca** (e.g., snails, octopuses) ### Step 3: Determine Relationships Between Phyla - **Caudata** is distinct from all non-caudate phyla. - **Echinodermata** is a non-caudate phylum. - **Cnidaria**, **Platyhelminthes**, **Annelida**, **Arthropoda**, and **Mollusca** are also non-caudate phyla. ### Step 4: Identify the Most Distantly Related Phyla Since **Caudata** (Chordates) and **Echinodermata** (a non-caudate phylum) belong to different groups, they are the most distantly related. The other phyla listed are all non-caudates and share more similarities with each other than with Caudata. ### Conclusion The two most distantly related phyla are **Caudata** and **Echinodermata**. ### Final Answer **Caudata and Echinodermata** are the two most distantly related phyla. ---
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