Which among the following have scales?
(i) Amphibians (ii) Pisces
(iii) Reptiles (iv) Mammals

Options

A. (i) and (iii)
B. (iii) and (iv)
C. (ii) and (iii)
D. (i) and (ii)

Explanation

To determine which among the given groups have scales, we can analyze each option step by step:

### Step-by-Step Solution:

1. **Identify the Groups**: The groups provided in the question are:
- (i) Amphibians
- (ii) Pisces (Fish)
- (iii) Reptiles
- (iv) Mammals

2. **Understand the Characteristics of Each Group**:
- **Amphibians**: These animals (like frogs and salamanders) have moist skin that is permeable to water and gases. They do not have scales.
- **Pisces (Fish)**: Fish have scales as part of their integumentary system. These scales serve as protection and are typically made of bony material.
- **Reptiles**: Reptiles (like snakes and lizards) have scales that are composed of keratin, which helps in preventing water loss and provides protection.
- **Mammals**: Mammals generally do not have scales. Their skin is covered with fur or hair, and they may have other structures like nails or hooves.

3. **Conclusion**: From the analysis:
- **Pisces** (Fish) and **Reptiles** are the groups that have scales.
- **Amphibians** and **Mammals** do not have scales.

4. **Final Answer**: The groups that have scales are **Pisces (ii)** and **Reptiles (iii)**.