The very primitive organism is the oldest because, over time, organisms gradually evolved into more complex organisms. First came the primitive organism, then it evolved into the more complex one, or the younger fossil.
        
                    
             
        
        
        
Answer: it would block your airways to stop you from breathing
Explanation:
its easy just think if your noise was stuffy it would be hard to breath did a 6th grader really have to tell you that
 
        
             
        
        
        
Organ- a group of tissues in a living organism 
examples- heart, lungs, liver, kidney, and stomach
        
                    
             
        
        
        
Organism, population, community, ecosystem, biosphere
        
             
        
        
        
Answer:
<u>Repeat a behaviour.</u>
Explanation:
When we adopt a new behaviour, a neural pathway is created and it gets stronger when we repeat until it become a new normal behaviour or a habit. When a message travels in a same neuronal pathway again and again, the brain begin to transmit it even more faster and these behaviours become automatic.