Which of the following group of living things have gills?

Options

A. Fish
B. Ferns and birds
C. Mushrooms and fish
D. Mosses and insects

Answer

To determine which group of living things have gills, we need to analyze the options provided in the question.

### Step-by-Step Solution:

1. **Identify the Groups**: The question asks about groups of living things that have gills. The options typically include fish, birds, mushrooms, mosses, and insects.

2. **Understanding Gills**: Gills are specialized organs used for breathing in aquatic animals. They extract oxygen from water, similar to how lungs extract oxygen from air in terrestrial animals.

3. **Evaluate Each Group**:
- **Fish**: Fish are aquatic animals that have gills. They use gills to breathe underwater. Therefore, this group definitely has gills.
- **Birds**: Birds are terrestrial animals that have lungs, not gills. So, this group does not have gills.
- **Mushrooms**: Mushrooms do have structures called gills (lamellae) under their caps, but these are not gills in the same sense as in fish. They are part of the mushroom's reproductive structure, not a respiratory organ. However, they do use the term "gills" in a different context.
- **Mosses**: Mosses are plants and do not have gills. They do not breathe in the same way animals do; instead, they absorb moisture and carbon dioxide through their surfaces.
- **Insects**: Insects typically have a respiratory system that includes tracheae, not gills. Some aquatic insects may have gill-like structures, but they are not true gills.

4. **Conclusion**: Based on the analysis, the group that has true gills is **Fish**. However, if considering the context of the term "gills" as used in mushrooms, then mushrooms could also be included in a broader interpretation.

5. **Final Answer**: The correct answer is that **Fish** have gills, and mushrooms also have gills, but in a different context.