Monomers make up polymers
polymers make up macromolecules
        
             
        
        
        
Hello!
Could be either:
<span>The action or process of observing something or someone carefully or in order to gain information.
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Or 
<span>A remark, statement, or comment based on something one has seen, heard, or noticed.
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And in Science:
 <span>An 'observation' in the scientific sense, is when you make a measurement or evaluation of some sort. You would usually make a note of how something has changed sine the previous ovbservation. Maybe the temperature has changed: gone up one degree; or a crystal has grown: maybe it is now .1 centimeters longer. 
"Observations" usually implies that you are watching some process, and either measuring or noting the change that has taken place. usually you will also want to note the time of the observation, so that you can have an idea of how quickly (or slowly) the changes are occurring.
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Hope this All Helps (Hope it did)! Have A Wonderful Day! :)
        
             
        
        
        
Answer:
The specimen are placed in vacuum while examining the cells or living organisms. Also, the electron must penetrate inside of the cell and in such conditions, any living organism is not able to survive. Thus, this reason best explains the answer to why dead cells specimen must be used for Transmission electron microscopy.
Explanation:
 
        
             
        
        
        
Answer:
In the wild, boa constrictors typically eat wild pigs, monkeys, bats, birds, lizards, squirrels, and rats. Basically, they'll eat anything they can possibly catch. 
<em>hope this helps!</em>
 
        
                    
             
        
        
        
Answer:
B. a food chain
Explanation:
Food chain: a hierarchical series of organisms each dependent on the next as a source of food.