The correct is D.
Disappear from a population.
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Ans. 
Lac (lactose) operon in a type of bacterial operon, which shows a cluster of genes that are regulated by a single promoter. It is composed of an operator, promoter, a terminator, and three structural genes (lacA, lacY, and lacZ), which are responsible for the transport and breakdown of lactose. 
The lac operon is an inducible operon as it gets activated in the presence of lactose and expressed its functional genes in the form of proteins (or enzymes) for lactose metabolism.  
Thus, the correct answer to be fill in first blank is 'inducible' and in second blank is 'lactose.'
 
        
                    
             
        
        
        
Answer:
C. Cholesterol
Explanation:
Cholesterol maintains the fluidity of the cell membrane and thereby, regulates its function.
Bile acids are derived from cholesterol which serves as their precursor. For example, Taurocholic acid is a polar derivative of cholesterol. Bile acids serve in the absorption of fatty acids, glycerol, and fat-soluble vitamins as these compounds are non-polar in nature.  
Vitamin D is produced when the derivative of cholesterol, 7-dehydrocholesterol undergoes photolysis in skin cells in presence of sunlight.  
 
        
             
        
        
        
If 100,000 kJ of energy is available to the producers, 1000 energy is available to the secondary consumers in this food pyramid.
<h3>What is 10 law of energy flow explain?</h3>
According to ten per cent law only 10 per cent of the energy entering a certain trophic level of organisms is known for transfer to the next higher trophic level. 
Thus, 1000 energy is available to the secondary consumers in this food pyramid.
To learn more about energy transfer click here:
brainly.com/question/1249777
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