Passive because the water flow gets weaker mark brainliest please and have a good day
        
                    
             
        
        
        
When temp rises the liquid rises to temp and when temp drops liquid drops to temp
        
                    
             
        
        
        
Answer:
B
Explanation:
Answer B is correct:
Because the biologists are continuing to learn more and more about such minute organisms, protozoan systematics – that is,  the taxonomy (classification) and the evolutionary interrelationships of major groups of protozoa – remains a  topic of debate and change, still today.
Some of the rather  LARGE and unwieldy taxonomic groupings of past years are  particularly subject to revision with expansion of and  refinement in the knowledge about the members of those –  and related – assemblages. Paradoxically, the protozoa  themselves are becoming more difficult to define with  precision as our information about them and other microbial assemblages increases. Thus, presenting a single  satisfactory circumscribed definition for them is not an  easy task.
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Answer A sounds so funny.
Answer C and D are false because Protozoans are usually single-celled and heterotrophic.
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Hope this answer can help you. Have a nice day!
 
        
             
        
        
        
The answer would be lipids, they are a type of biomolecule and a nucle is an organelle