Answer:
Weakening of digestive smooth muscle with age can cause constipation.
Explanation:
Smooth muscles in the digestive system have the role to move food down the tract via radially symmetrical contractions (peristalsis). With age, the function of smooth muscles reduces, causing the food to move more slowly through the alimentary canal (digestive tract). As a consequence, water gets absorbed from food waste, which can cause constipation.
 
        
             
        
        
        
They both are encased organelle compartments inside a cell but A vacuole is the vesicle found within a cytoplasm of a cell. The vacuole contains some fluid. A lysosome, on the other hand, is an organelle found within the cytoplasm of eukaryotic cells.
        
                    
             
        
        
        
mRNA would be CCAUCCUUUGGG
tRNA would be   GGUAGGAAACCC
 
        
             
        
        
        
Answer: D. A river separates members of a squirrel population that used to occupy the same geographical area.
Explanation:
Allopathic Speciation occurs when a geographic barrier (river, mountain, or canyon) separates members of a population 
Hope this helps!
 
        
             
        
        
        
Answer: The part of the enzyme where the substrate binds is called the active site (since that's where the catalytic “action” happens). ... Thanks to these amino acids, an enzyme's active site is uniquely suited to bind to a particular target—the enzyme's substrate or substrates—and help them undergo a chemical reaction. To catalyze a reaction, an enzyme will grab on (bind) to one or more reactant molecules. These molecules are the enzyme's substrates. In some reactions, one substrate is broken down into multiple products. ... The products then leave the active site of the enzyme.
Explanation: