A system of classification in which a large number of traits are considered is

Options

A. natural system
B. artificial system
C. phylogenetic system
D. synthetic system

Answer

To solve the question "A system of classification in which a large number of traits are considered is:", we will analyze the options provided and determine which classification system fits the criteria of considering multiple traits.

### Step-by-Step Solution:

1. **Understand the Classification Systems**:
- There are three main systems of classification: artificial, natural, and phylogenetic.

2. **Analyze the Natural System**:
- The natural system of classification considers a wide range of traits. These traits include:
- Morphological traits (structure and form)
- Anatomical traits (internal structure)
- Cytological traits (cell structure)
- Physiological traits (functions of organisms)
- Biochemical traits (chemical processes and substances)
- Since it incorporates a large number of traits, this system is comprehensive.

3. **Examine the Artificial System**:
- The artificial system is based on observable characteristics, often focusing on a single trait or a limited number of traits. This system is one of the oldest but does not consider a wide range of traits.

4. **Evaluate the Phylogenetic System**:
- The phylogenetic system is based on genetic and evolutionary relationships between organisms. While it is more comprehensive than the artificial system, it primarily focuses on genetic relationships rather than a broad range of traits.

5. **Consider the Synthetic System**:
- The synthetic system is based on morphological characters and non-evolutionary features, which means it does not consider a large number of traits either.

6. **Conclusion**:
- Among the options analyzed, the natural system of classification is the only one that considers a large number of traits. Therefore, the correct answer is the **natural system**.

### Final Answer:
The system of classification in which a large number of traits are considered is the **natural system**.