The study of interaction between groups of various organisms with their environment is

Options

A. ecology
B. zoogeography
C. synecology
D. system biology

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the study of interactions between groups of various organisms and their environment. This is a fundamental concept in biology.

2. **Analyzing the Options**:
- **Option 1: Ecology**: This is the study of how living organisms interact with each other and their environment. It fits the description given in the question.
- **Option 2: Zoogeography**: This is a branch of zoology that deals with the geographical distribution of animals. It does not focus on interactions with the environment in the way the question describes.
- **Option 3: Cyanoecology**: This is a specific field that studies how species populations interact with their environment, often referred to as community ecology. While it involves interactions, it is not as broad as the term ecology.
- **Option 4: System Biology**: This field studies the interactions and behaviors of biological entities, including molecules and cells, but does not specifically address the interactions between groups of organisms and their environment.

3. **Identifying the Correct Answer**: After analyzing all the options, it is clear that the correct answer is **Ecology**, as it encompasses the study of interactions between groups of organisms and their environment.

4. **Conclusion**: Therefore, the study of interaction between groups of various organisms with their environment is known as **Ecology**.

---