Name the harmful wastes which are removed from blood in urea cycle.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Urea Cycle**: The urea cycle, also known as the ornithine cycle, is a biochemical process that converts ammonia, a toxic by-product of protein metabolism, into urea, which is less toxic and can be excreted from the body.

2. **Identifying Harmful Wastes**: The primary harmful wastes that are removed from the blood during the urea cycle are:
- **Ammonia (NH₃)**: This is a highly toxic substance produced from the breakdown of proteins and amino acids. Its high solubility in water makes it difficult to excrete without a large amount of water.
- **Carbon Dioxide (CO₂)**: This is another waste product formed during the urea cycle when ammonia combines with carbon dioxide to form urea.

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