Final answer:
The three basic shapes of bacteria are round (cocci), rod like (bacilli), and spiral (spirilli), corresponding to answer D. These shapes are pivotal for the identification and classification of bacteria.
Step-by-step explanation:
The three basic shapes of bacteria are: round, rod like, and spiral. Therefore, the correct answer to the question is D. Round, rod like, and spiral. Bacteria are classified based on their morphology, and these three shapes correspond to:
- Cocci: spherical or round-shaped bacteria.
- Bacilli: rod-shaped bacteria.
- Spirilli: spiral-shaped bacteria. This category includes spirillum, spirochete, and vibrio, which are all variations of spiral-shaped bacteria.
In summary, these shapes can be seen using a microscope and are essential for identifying and classifying bacteria.