Answer:
37oC - temperature
It is important that the temperature is controlled because it maintains consistency and safety. 
Explanation:
-Temperature is a common type of controlled variable.
-A control variable is anything that is held constant or limited in a research study
 
        
             
        
        
        
Answer: Options A, B, C, D at correct
Explanation:
Cnidarians are a branch of invertebrates characterised by by a radially symmetric body including a saclike internal cavity and nematocysts; stinging structures that aids in feeding. They are also known as coelentrates. They are diploblastic (2 body layer). They also reproduce asexually by various mean including budding. Example include sea anemones, hydra, corals, jellyfish etc
 
        
                    
             
        
        
        
Answer:
B. Oxygen molecules recombine to allow cells to get larger
 
        
             
        
        
        
Cellulose. Our bodies as humans lack enzymes to break the cellulose down.