The bacterial structure is very (A)____, they are very complex in (B)____

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
- The question asks us to fill in the blanks for two statements about bacterial structure and complexity.

2. **Analyzing the First Blank (A):**
- The question states, "The bacterial structure is very (A)____."
- Bacteria are known to have a relatively simple structure compared to more complex organisms. They are single-celled organisms without membrane-bound organelles.

3. **Filling in the First Blank:**
- Based on the analysis, we can conclude that the appropriate word to fill in the blank (A) is "simple."
- Thus, the statement becomes: "The bacterial structure is very simple."

4. **Analyzing the Second Blank (B):**
- The question continues, "they are very complex in (B)____."
- While bacteria have a simple structure, they exhibit complex behaviors, such as responding to environmental changes, moving toward favorable conditions, and interacting with other organisms.

5. **Filling in the Second Blank:**
- Given the complexity of their behaviors, the appropriate word to fill in the blank (B) is "behavior."
- Therefore, the complete statement is: "they are very complex in their behavior."

6. **Final Answer:**
- The bacterial structure is very (A) simple, they are very complex in (B) behavior.