Mercury is 46 million kilometers away from the sun
        
             
        
        
        
Answer:
An operon consists of a group of genes which are controlled by a single promoter. 
The lac operon present in the E.coli comprises of genes for making proteins which  breakdown lactose into glucose.
Normally, the lac operon will be turned of by a repressor when there is not enough lactose present. 
When lactose is present in the cell, the operon is activated when lacl forms a bond with the promoter region due to its changes in the structure. This causes the process of transcription to occur. 
 
        
             
        
        
        
Answer:
The reactants for photosynthesis are light energy, water, carbon dioxide and chlorophyll, while the products are glucose (sugar), oxygen and water.
Explanation:
This is where I got the information:
sciencing.com/reactants-products-equation-photosynthesis-8460990.html
I hope this helps!
 
        
             
        
        
        
Answer:
Long life span
Explanation:
A model organism is a non  human specie that is used for study in order to understand a particular biological phenomena. 
One of the qualities of a model organism is that; It should have a short life span this will make it more amenable to experimental manipulation due to short generational time. Therefor Long life span will not be a desirable characteristic.
Other desirable characteristic includes ease of growth and production of many offsprings. 
Also common genetic mechanism with other organisms, they should share some degree relatedness.  
 
        
             
        
        
        
Because a cap is something on top like the armour