positive feedback could be contractions(as painful as it may seem, its true) in child birth and the ripening of fruit.
negative feedback  include the regulation of blood glucose levels and osmoregulation
 
        
                    
             
        
        
        
6-C (breaks off)
7-C(they secrete acid that breaks away rocks)
        
             
        
        
        
The answer is <span>B. contains enzymes that begin the breakdown of proteins.
Saliva is watery substance secreted by salivatory glands. <em>It cleanses the mouth</em> and maintenance oral hygiene. <em>It moistens the food</em>, so the created food bolus could easier pass into the esophagus. It also <em>carries food chemicals to taste receptors</em> so they can be tested. It contains enzymes involved in the food digestions. Some of them are amylase, which begins the breakdown of the starch, and lipase, which begins the breakdown of triglycerides. <u>There are no enzymes in the saliva that break down proteins</u>.</span>
        
             
        
        
        
The right answer is hyphae for the first gap, mycelium for the second gap.
The hyphae constitute the vegetative apparatus of the mushrooms, while the visible part, that which is improperly called mushroom, is in fact its reproductive apparatus.
Hyphae are less branched filaments consisting of a single cell that can be several centimeters long. They contain several nuclei and can sometimes be partitioned.
The mycelium is a part of the mushroom (composed by many hyphae), which is in the form of white filaments and grows about fifteen centimeters under the ground. It is this part of the mushroom that has therapeutic properties because the filaments of the mycelium are going to draw the minerals in the soil.
 
        
             
        
        
        
Answer:
silt 3
Explanation:
an aquaferis a rock layers that stores and allows the flow of groundwater