A group of animals which are related by descent and share many similarities are referred to as

Options

A. breed
B. race
C. variety
D. species

Explanation

To answer the question, "A group of animals which are related by descent and share many similarities are referred to as," we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a term that describes a group of animals that are related by descent and share similarities. This implies a genetic relationship and common characteristics among the animals.

2. **Evaluating the Options**:
- **Option 1: Breed**: A breed is a group of animals that are similar in characteristics and can interbreed. Breeds are indeed related by descent and share many similarities. This option fits the criteria of the question.

- **Option 2: Race**: The term "race" typically refers to physical characteristics such as color and height. While it may describe groups of animals, it does not necessarily imply a genetic relationship or descent. Thus, this option does not fit the question well.

- **Option 3: Variety**: Variety refers to differences among individuals within a group. It emphasizes diversity rather than similarity and does not indicate a genetic relationship. Therefore, this option is not suitable for the question.

- **Option 4: Species**: A species is a group of organisms that can interbreed and produce fertile offspring. While species share many similarities, they may not always be related by descent in the strictest sense. This option does not fully meet the criteria of the question.

3. **Conclusion**: After evaluating all the options, the best answer is **Option 1: Breed**. This is because a breed is a group of animals that are related by descent and share many similarities.

### Final Answer:
A group of animals which are related by descent and share many similarities are referred to as **Breed**.

---