Some of the things observed when a human red blood cell is placed under a microscope are:
- They have a donut shape
- They look like biconcave discs
- The presence and/or absence of a nucleus
<h3>What is a Microscope?</h3>
This refers to the lab tool that is used to view very small objects in detail to find out their properties.
Hence, we can see that although your question is incomplete, a general idea of things that can be observed when a human red blood cell is placed under a microscope was discussed.
Read more about microscopes here:
brainly.com/question/13520094
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It will be superior Vena Cava also known as anterior Vena cava
Answer- A mucous
Explanation