It's important because it helps you measure things. The prefixes are telling you the distance or meters, etc.
        
                    
             
        
        
        
The answer is Amoeba; pseudopod; Euglena; flagellum;  paramecium; cillia.
Protozoan are organism, usually single-celled and heterotrophic belonging to any of the major lineages of protists and, like most protist, protozoa are microscopic. all protozoans are eukaryotes and therefore possess a true or a membrane-bound nucleus. Examples of protozoa include; Amoeba, Euglena, Paramecium. They exhibit diverse modes of locomotion across the various groups, but the modes of locomotion can be broadly divided into flagellar, ciliary, and amoeboid movement.
        
                    
             
        
        
        
those are nucleotides 
since all three of them contain deoxyribose (because there's only one hydroxil group) they are DNA nucleotides
the first nucleotide has cytosine as it's nitrogenous base 
the second nucleotide has adenine as it's nitrogenous base 
the third nucleotide has thymine as it's nitrogenous base
 
        
             
        
        
        
Answer: Option A "Choroid plexus".
Explanation: 
Cerebrospinal fluid can be defined as the fluid that is found in the brain and spinal cord of human beings. It is a clear and colorless fluid.
The production of cerebrospinal fluid takes place by the specialized ependymal cells that lies in the choroid plexuses which is present in the  ventricles of brain.
The amount of cerebrospinal fluid in a day is 500mL. This fluid acts as cushion that protects the brain from mechanical and immunological protection.
Hence, the correction answer is option A 
 
        
             
        
        
        
 Watts are defined as 1 Watt = 1 Joule per second (1W = 1 J/s) which means that 1 kW = 1000 J/s.