Microbes are extremely tiny organisms that can only be seen through a . A. telescope B. binoculars C. stethoscope D. microscope

Microbes are extremely tiny organisms that can only be seen through a _______.

Microbes are microscopic organisms, meaning they are too small to be seen without magnification.

• A telescope is used to view distant objects.
• Binoculars are used to view distant objects.
• A stethoscope is used to listen to internal body sounds.
• A microscope is specifically designed to magnify very small objects, like microbes.

Therefore, the correct option is D.

The final answer is $\boxed{\text{D. microscope}}$