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

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of Bacteria:**
- Bacteria are unicellular organisms classified as prokaryotes. Their cellular structure is relatively simple compared to eukaryotic cells.
- Key features include a cell wall, plasma membrane, cytoplasm, ribosomes (70S), and a nucleoid region where genetic material is located without a surrounding membrane.

2. **Filling in the First Blank (A):**
- The question states, "The bacterial structure is very (A)____."
- Given the simplicity of bacterial structures, the appropriate word to fill in the blank is "simple."
- Therefore, A = simple.

3. **Understanding Bacterial Behavior:**
- Although bacteria have a simple structure, their behavior can be quite complex. For example, bacteria can respond to environmental stimuli, such as moving towards nutrients through a process called chemotaxis.
- This ability to sense and respond to their environment indicates a level of complexity in their behavior.

4. **Filling in the Second Blank (B):**
- The question continues, "they are very complex in (B)____."
- Based on the discussion of bacterial behavior, the suitable word to fill in this blank is "behavior."
- Therefore, B = behavior.

5. **Final Answer:**
- The completed sentence reads: "The bacterial structure is very simple, they are very complex in behavior."