The correct definition of a family may be `:-`

Options

A. it is an aggregate of distantly related genera
B. ir is a group of genera present in a given area.
C. It is an aggregate of closely related genera
D. It is a group of species present in a common habitat

Explanation

To solve the question regarding the correct definition of a family in biological taxonomy, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Taxonomic Ranks**:
- Taxonomy is the science of classification of living organisms. The hierarchy of taxonomic ranks includes species, genus, family, order, class, phylum, kingdom, and domain.
- A family is a higher taxonomic rank that groups together similar genera.

2. **Analyzing the Options**:
- We have four options to consider:
1. An aggregate of distantly related genera.
2. A group of genera present in a given area.
3. An aggregate of closely related genera.
4. A group of species which are present in a common habitat.

3. **Evaluating Each Option**:
- **Option 1**: "An aggregate of distantly related genera" - This is incorrect because a family consists of closely related genera, not distantly related ones.
- **Option 2**: "A group of genera present in a given area" - This option is vague and does not accurately define a family, as it does not emphasize the relationship between the genera.
- **Option 3**: "An aggregate of closely related genera" - This is the correct definition of a family, as it accurately describes that a family consists of genera that share a close evolutionary relationship.
- **Option 4**: "A group of species which are present in a common habitat" - This is incorrect because it refers to species, not genera, and does not define a family.

4. **Conclusion**:
- After evaluating all options, the correct definition of a family is "an aggregate of closely related genera."

### Final Answer:
The correct definition of a family is **"an aggregate of closely related genera."**

---