The effect of a catalyst is to increase the speed of the reaction, this is the speed at which reactants, A and B, are consumed, ant the product, C, is produced.
Given that when C is produced the solution bubbles, the bubbles are an indication of progression of the reaction.
The greater the speed of reaction, the earlier the reaction will end and the earlier the bubbles will stop.    
So the student can identify the catalyst because the bubbles will stop first.
Answer: <span>The test tube that stops bubbling first contains the catalyst.</span> 
        
             
        
        
        
The correct answer is (4) Autotrophic organism. 
Green plants make their own food by the process of photosynthesis using sunlight. Most of the autotrophs use carbon dioxide, sunlight and carbon dioxide to produce glucose that is used by the plants to obtain energy. Most of the oxygen comes from these organisms and decrease in the number of green plants can lead to several problems due to decrease in the amount of oxygen. Example: green plants, algae, and even some bacteria. This food and oxygen is produced by the action of autotrophic organisms
 
        
                    
             
        
        
        
I'd say the answer to this one is B, skunks and toads have a predator-prey relationship. Good Luck!
        
                    
             
        
        
        
There are different ways to treat the problem. You can apply heat to infected area, elevate your leg, use an over the counter anti-infammation drug, and possibly wear a compression stocking.
        
             
        
        
        
Answer:
Explanation:
Stage IV (stage 4 liver cancer): The cancer has spread to nearby lymph nodes and may have grown into nearby blood vessels or organs. Advanced liver cancer does not often metastasize (or travel to distant organs), but when it does, it is most likely to spread to the lungs and bones.