Phylogenetic system of classification includes

Options

A. evolutionary trends only
B. genetic trends only
C. evolutionary trend as well as morphology
D. behavioural trends in environment

Answer

To solve the question regarding what the phylogenetic system of classification includes, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Phylogenetic Classification**:
- The phylogenetic system of classification is based on the evolutionary relationships among organisms. It emphasizes the evolutionary descent of a group of organisms.

2. **Identifying Key Components**:
- The classification is constructed with the idea that all descendants of a common ancestor should be grouped together. This means that the classification reflects evolutionary trends.

3. **Differentiating Between Trends**:
- The question presents several options: evolutionary trends, genetic trends, and morphological/behavioral trends.
- It's important to note that while phylogenetic classification focuses on evolutionary relationships, it does not specifically include genetic trends or morphological/behavioral trends.

4. **Conclusion**:
- Based on the understanding that phylogenetic classification is primarily concerned with evolutionary relationships, the correct answer to the question is that it includes **evolutionary trends only**.

### Final Answer:
The phylogenetic system of classification includes **evolutionary trends only**.

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