The invention of the electron microscope opened up many doors for biologists as it helped them to view and learn the appearance of cells and their sub-cellular structures 
<h3>What is an electron microscope?</h3>
Electron microscope are microscopes which helps biologists to view the appearances of cells of organisms which cannot be seen with our nak -ed eyes.
Generally, electron microscopes:
- Uses a beam of accelerated electrons as its source of illumination
- Helps in obtaining high resolution images of biological and non-biological specimens. 
- It is also used in biomedical research
In conclusion, electron microscope helps biologists to view, learn and to also understand the appearance of cells and their sub-cellular structures 
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Found this quizlet with the answer hope it helped
 
        
        
        
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The correct answer is option c) "It is necessary to have a completely functioning pentose phosphate pathway for a tissue to synthesize ribose phosphates".
Explanation:
While the pentose phosphate pathway is the most common way at which a tissue synthesize ribose phosphate, it is false to affirm that it is necessary for ribose phosphate synthesis. Tissues have alternatives to the pentose phosphate pathway to synthesize ribose phosphate. For instance, the nucleotide salvage or the salvage pathway allows tissues to synthesize ribose phosphate from intermediates in the degradative pathway for nucleotides.
 
        
             
        
        
        
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In each half of the spinal cord, white matter is divided into three major bundles, called funiculi. The dorsolateral sulcus marks the division between dorsal funiculus and lateral funiculus.
Explanation:
 
        
             
        
        
        
Answer: ONLY If your abdominal pain is serious, doesn't go away, or keeps coming back, talk to your doctor. Call 911 right away if your belly hurts because you had a recent injury there or if you have any chest pain. You should also contact your doctor as soon as you can if you have symptoms along with the pain, such as: Fever.
Explanation: IF NOT SERIOUS- Drinking water. ... 
Avoiding lying down. ... 
Ginger. ... 
Mint. ... 
Taking a warm bath or using a heating bag. ... please give me brainliest ❤️ ty