Read the following statements and select the correct option.
Statement 1: Dental formula gives the number of teeth in the half of each jaw.
Statement 2: Dental formula can be expressed for insectivorous mammals as well as for the nonmammalian vertebrates.

Options

A. Both statements 1 and 2 are correct
B. Statement 1 is correct but statement 2 is incorrect
C. Statement 1 is incorrect but statement 2 is correct.
D. Both statements 1 and 2 are incorrect.

Explanation

To determine the correctness of the given statements about the dental formula, we will analyze each statement step by step.

### Step 1: Analyze Statement 1
**Statement 1:** "Dental formula gives the number of teeth in the half of each jaw."

- The dental formula is a shorthand notation that represents the number and types of teeth in an organism's mouth. It typically indicates the number of teeth present in one half of the upper jaw and one half of the lower jaw.
- For example, in humans, the dental formula is represented as 2-1-2-3 / 2-1-2-3, which indicates the number of incisors, canines, premolars, and molars in one half of each jaw.
- Therefore, Statement 1 is **correct**.

### Step 2: Analyze Statement 2
**Statement 2:** "Dental formula can be expressed for insectivorous mammals as well as for the non-mammalian vertebrates."

- The dental formula is primarily used for mammals, particularly those that are heterodont (having different types of teeth).
- Insectivorous mammals have a specific dental formula that reflects their dietary adaptations, but the dental formula is not typically applied to non-mammalian vertebrates (like reptiles or fish) in the same way.
- Non-mammalian vertebrates do not possess the same diversity of tooth types as mammals, and thus, the concept of a dental formula is not applicable to them.
- Therefore, Statement 2 is **incorrect**.

### Conclusion
- Based on the analysis, Statement 1 is correct, while Statement 2 is incorrect. Thus, the correct option is that only Statement 1 is true.

### Final Answer:
- Statement 1 is correct, and Statement 2 is incorrect.

**Correct Option:** Statement 1 is correct, Statement 2 is incorrect.

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