Answer:
lactose, repressor, RNA polymerase (or mRNA might fit here), transcription, repressor, RNA polymerase
Explanation:
Hope this will help. 
 
        
             
        
        
        
The species was a keystone species.
Keystone species are the species that ''hold the ecosystem together''.
They have an important role in the trophic networks (food chains) and often they can even afflict changes in the abiotic part of the ecosystem (change the composition of soil, purify the water, lower the effect of the wind etc)
Therefore, when a keystone species is removed it affects greatly the whole ecosystem.
        
             
        
        
        
Answer:
Probably forest land but that is just my guess
Explanation:
 
        
             
        
        
        
Answer:
Organic matter : biofuels
Explanation:
Biomass is derived from Organic matter in the soil and is used to produce Biofuels. Hope this helps
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