Name the group of animals which have red blood cells.

Explanation

To answer the question "Name the group of animals which have red blood cells," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Classification**: The classification of living organisms has evolved over time. One of the earliest classifications was proposed by Aristotle, who categorized organisms based on their morphological characteristics.

2. **Classification of Animals**: Aristotle divided animals into two main groups based on the presence or absence of red blood cells. This classification is foundational in understanding the diversity of animal life.

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