Can microorganisms be seen with the naked eyes: 

• The small organisms in our nature are called microorganisms.
• Organisms that can be seen easily with the naked eye are classified under microorganisms.
• Bacteria, protists, fungi and algae are the microorganisms.
• With the help of a microscope, we can observe the microorganisms.
• On the earth everywhere, we can find different types of microorganisms.
• In our body also there are lots of microorganisms that live on our body or in our body.
• Microorganisms' size can be 0.2mm to 2mm.
• Microorganisms can cause many diseases in humans, animals and in plants.
• Microorganisms are also helpful to us, they are used to produce curd, bread, wine and vaccines.

Hence, option B is the correct answer.