Alien species are a threat to native species. Justify taking example of an animal and a plant alien species.

Explanation

### Step-by-Step Solution:

1. **Define Native and Alien Species**:
- Native species are those organisms that are naturally found in a specific habitat. They have evolved and adapted to the local environment over time.
- Alien species, also known as non-native species, are organisms that are introduced to a habitat where they do not naturally occur. They can be introduced intentionally or accidentally.

2. **Understanding the Threat of Alien Species**:
- Alien species can become invasive when they establish themselves in a new habitat and spread rapidly. This can lead to competition with native species for resources such as food, space, and nutrients.
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