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Hard calcium carbonate structures are us...

Hard calcium carbonate structures are used as skeleton by

A

Echinodermata

B

Protochordata

C

Arthropoda

D

Nematoda

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### Step-by-Step Solution: 1. **Understanding the Question**: The question asks which group of organisms uses hard calcium carbonate structures as their skeleton. 2. **Analyzing the Options**: The options provided are: - Echinodermata - Protocordate - Arthropod - Nematoda 3. **Identifying Characteristics of Each Group**: - **Echinodermata**: This group includes organisms like starfish and sea urchins. They have a body wall that is covered by spiny structures made of calcium carbonate, which contributes to their skeleton. - **Protocordate**: This group includes primitive chordates, which do not have a skeleton made of calcium carbonate. - **Arthropod**: This group includes insects, arachnids, and crustaceans. They have an exoskeleton made of chitin, not calcium carbonate. - **Nematoda**: This group includes roundworms, which have a hydrostatic skeleton and do not utilize calcium carbonate. 4. **Conclusion**: Among the given options, only Echinodermata has a skeleton made of hard calcium carbonate structures. Their skeleton is known as an endoskeleton, which is composed of calcareous plates called ossicles. 5. **Final Answer**: The correct answer is **Echinodermata**.
### Step-by-Step Solution: 1. **Understanding the Question**: The question asks which group of organisms uses hard calcium carbonate structures as their skeleton. 2. **Analyzing the Options**: The options provided are: - Echinodermata - Protocordate - Arthropod ...
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