I believe the blank is "mass."
 
        
                    
             
        
        
        
Answer:
Aristotle first wrote about the practice of animal testing in ancient
Greece during the third century BC.
Explanation:
 
        
                    
             
        
        
        
Answer:
Human interaction with the ecosystem has rapidly spread disease to Yellowstone's wildlife, which has proven to have adverse effects on populations. Also, humans tend to leave trash in poor areas. Littering is a problem in Yellowstone because it can be ingested by the wildlife and also pollute the park.
Explanation:
 
        
             
        
        
        
Answer:
c. The starch stayed in the bag and the iodine leaked into the bag and the reacted with it, turning the solution black.
Explanation:
According to the given information, the solution inside the dialysis tubing has starch while water present outside has iodine. The color of the water present outside the dialysis tubing does not change which means that starch did not leak out of the bag and stayed in the bag itself. On the other hand, the starch solution present inside the bag turned black representing the fact that iodine entered the bag. The reaction of starch with iodine produces a blue-black color.
 
        
             
        
        
        
from left to right they're vegetative propagation, budding, regeneration and pollination