Answer:
One
Explanation:
In a controlled experiment only one variable is changed at a time, while the others are kept the same/controlled so changes can be observed and a causation can be determined.
 
        
             
        
        
        
Answer:
★ C. fossils of marine organisms are found at the top of some mountains
Explanation:
Hope you have a great day :)
 
        
             
        
        
        
The ventromedial hypothalamus is the part of the brain that
is responsible for hunger, fear, and even the sexual activity. In this problem,
researchers destroyed snippy’s ventromedial hypothalamus, this means that
snippy will not be able to feel hunger, fear and will not be active in sexual
activities.
 
        
             
        
        
        
Regulation of HMG-CoA reductase is termed as the rate of controlling enzyme of the mevalonate pathway which produces other isoprenoid and cholesterol.
The regulation of cholesterol is done by regulating the rate which determines step catalyzed by HGM -CoA reductase.
There is long-term and short-term regulation where HGM-CoA is inhibited by phosphorylation and catalyzed of proteins. There is regulated proteolysis of HGM-CoA reductase where degradation of HMG-CoA reductase by oxidized derivatives of cholesterol.
        
             
        
        
        
It's C parasitism 
for example tape worms are segmented flat worms that attach themselves to the inside of the intestine.They get food by eating the hosts of nutrients.While say the cow or pig get a disease,