Define and understand the following terms:
(i) Phylum (ii) Class (iii) Family (iv) Order (v) Genus

Explanation

### Step-by-Step Text Solution:

1. **Phylum**:
- Definition: A phylum is the second highest unit of classification in the biological hierarchy. It includes one or more related classes of animals. In the case of plants, the term "division" is used instead of phylum.
- Example: The phylum Chordata includes classes such as Mammalia (mammals), Aves (birds), and Reptilia (reptiles).

2. **Class**:
- Definition: A class is a taxonomic group that consists of one or more related orders. It is a lower rank than phylum.
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