Answer:
There are no options to this question, however, it can be answered. The answers to the blank spaces are:
1. Fatty Acids
2. A decrease in the rate of lipid breakdown
Explanation:
Lipids are large biomolecules that are formed from monomeric units called FATTY ACIDS. Digestive enzymes such as lipase as described in this question breaks down lipids into its monomer called FATTY ACIDS. 
However, enzymes are proteinous molecules, meaning they are subject to denaturation when exposed to adverse conditions such as heat. According to this question, the scientist heats the enzymes and finds that it can't bind onto the lipids anymore because it has been DENATURED. This situation will result in the DECREASE IN THE RATE OF LIPID BREAKDOWN because the enzyme in charge is no longer functional. 
 
        
                    
             
        
        
        
The fill in the blank answer is increased
        
             
        
        
        
I believe the answer is true. Humans have a digestive track, which removes unwanted matter from the body.
        
                    
             
        
        
        
Answer: D. Epinephrine 
Explanation:
During perceived danger the fight-or-flight response includes faster heart beat, quickened breath, tense muscles and thought speed up. This co-ordinated set if physiological changes is triggered by two hormones of the adrenal gland, epinephrine and norepinephrine.
The major activities of these hormones is to increase the amount of chemical energy available for immediate use, increase the heart rate and stroke volume and dilate the bronchioles in the lungs, action the raise the rate of oxygen delivery to the cell.
Answer is epinephrine 
 
        
             
        
        
        
Notchochord, morphology, chordates