To which phyla do the following animals belong and why?

Ascaris (roundworm)
Phylum: __________________
_______________
Reason:_______________________
_________________.

Explanation

**Step-by-Step Solution:**

1. **Identify the Animal**: The animal in question is Ascaris, commonly known as a roundworm.

2. **Determine the Phylum**: Ascaris belongs to the phylum **Nematoda**. This phylum is also referred to as **Aschelminthes** in some classifications.

3. **Provide the Reason**: The reason Ascaris is classified under the phylum Nematoda is due to its distinct characteristics:
- It has a **cylindrical, unsegmented body**.
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