Answer:
The microscope is an instrument used for the visualization of the cell and its other component. Different types of microscope are compound microscope, electron microscope and binocular microscope.
The adjustment of the slide is important to visualize the focused object. A proper source of light is required to focus the image. At high magnification, the fine focus control is used for the adjustment. At 100 X the oil is used to visualize the object. 
 
        
             
        
        
        
(Different)apparent magnitude is how bright the star appears from earth and absolute magnitude is how bright the star appears at a standard distance 
        
             
        
        
        
Answer:
A vaccine activates our immune system without making us sick. Many dangerous infectious diseases can be prevented in this simple and uncostful
drug  .Vaccines have eliminated some of the most dangerous, fatal diseases in human history.
 
        
                    
             
        
        
        
The answers to this question are the following:
Base- pairing rule where RNA was made where the U strand being paired to A-strand and the C strand being paired to G-strand in transcription within the nucleus. This is done along with the intense strand in "DNA".
The answer in the first line is "Base-pairing rule" while in the second line is "DNA".