Mark the odd one in the series.
Plantae, Chordata, Tracheophyta , Eucalyptus

Explanation

To solve the question of identifying the odd one out from the series: Plantae, Chordata, Tracheophyta, and Eucalyptus, we can follow these steps:

### Step 1: Identify the Categories of Each Term
- **Plantae**: This is a kingdom that includes all plants.
- **Chordata**: This is a phylum within the animal kingdom that includes all animals with a notochord (like vertebrates).
- **Tracheophyta**: This is a phylum of vascular plants (a subgroup of Plantae).
- **Eucalyptus**: This is a genus of trees and shrubs within the plant kingdom.

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