Mention the characteristic features of Euglena in support of its inclusion in animal kingdom. Also mention the features which contradict its placement.

Explanation

### Step-by-Step Solution

**Step 1: Introduction to Euglena**
Euglena is a unicellular organism that belongs to the kingdom Protista. It is often studied in the context of both plant and animal characteristics due to its unique features.

**Step 2: Characteristics Supporting Inclusion in Animal Kingdom**
1. **Locomotion**: Euglena possesses a flagellum, a whip-like structure that aids in movement. This feature is similar to many animal cells that use cilia or flagella for locomotion.
2. **Lack of Cell Wall**: Unlike plant cells, Euglena does not have a rigid cell wall. This characteristic is more aligned with animal cells, which have flexible cell membranes.
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