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First time exertory system evolved in th...

First time exertory system evolved in the organisms of

A

Platyhelminthes

B

Nematoda

C

Annelida

D

Arthropoda

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Excretory System:** - The excretory system is responsible for the removal of waste products from the body. It plays a crucial role in maintaining homeostasis by regulating the composition of body fluids. 2. **Identifying the First Organisms with Excretory Systems:** - The question asks about the first organisms in which the excretory system evolved. We need to analyze different groups of organisms to determine which one had a more advanced excretory system. 3. **Analyzing Different Groups:** - **Platyhelminthes (Flatworms):** They possess flame cells for excretion, which are simple and operate through diffusion. These are not considered true excretory glands. - **Nematoda (Roundworms):** They have a simple excretory system with renette glands, which also do not qualify as a true excretory system. - **Annelida (Segmented Worms):** They have nephridia, which are primitive excretory structures. However, they are still considered simple. - **Arthropoda (Insects and Crustaceans):** This group has a more advanced excretory system, including Malpighian tubules and green glands. These structures allow for more efficient waste removal. 4. **Conclusion:** - Based on the analysis, the first true excretory system evolved in the Arthropoda group, which includes insects and crustaceans. Therefore, the correct answer is **Arthropoda**. **Final Answer:** The first excretory system evolved in the organisms of **Arthropoda**. ---
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