Read the statements carefully and select the correct option for bacteria.
`1.` They are the sole memebers of the kingdom-monera.
`2`. Cannot live in snow and deep oceans.
`3`. No bacteria live in or on the other organisms as parasites.
`4`. Have simple structure and complex behaviour.

Options

A. `1 & 2`
B. `2 &3`
C. `3 & 4`
D. `1 &4`

Answer

To solve the question, we need to evaluate each statement about bacteria and determine which ones are correct.

### Step-by-Step Solution:

1. **Evaluate Statement 1**: "They are the sole members of the kingdom Monera."
- This statement is **correct**. Bacteria are indeed the only members of the kingdom Monera, which includes prokaryotic organisms.

2. **Evaluate Statement 2**: "Cannot live in snow and deep oceans."
- This statement is **incorrect**. Bacteria can thrive in a wide range of environments, including extreme conditions such as snow and deep oceans.

3. **Evaluate Statement 3**: "No bacteria live in or on the other organisms as parasites."
- This statement is **incorrect**. Many bacteria are heterotrophic and can live as parasites on or in other organisms, including humans.

4. **Evaluate Statement 4**: "Have simple structure and complex behaviour."
- This statement is **correct**. Bacteria have a simple cellular structure (prokaryotic) but can exhibit complex behaviors, such as forming biofilms and having diverse metabolic pathways.

### Conclusion:
Based on the evaluations, the correct statements about bacteria are:
- Statement 1: Correct
- Statement 2: Incorrect
- Statement 3: Incorrect
- Statement 4: Correct

Thus, the correct options for bacteria are **1 and 4**.