Answer:
oxygen, carbon, hydrogen and nitrogen, a lot of it in the form of water.
Explanation:
 
        
                    
             
        
        
        
Answer:
b, 8-10
Explanation:
your body needs 20 amino acids to grow, repair and function, however, only nine amino acids are 'essential' as such. 
they are histidine, valine, isoleucine, methionine, phenylalanine, threonine, tryptophan, leucine, and lysine
hope this helps! :)
 
        
                    
             
        
        
        
I’m not sure if that’s the answer but what immediately pops up in my mind is the food chain. Primary consumers (herbivores) consume producers (plants). Secondary consumers consume primary consumers etc. At the end of the day, all kinds of animals die and decompose, providing nutrients for producers to grow, continuing the circle of life.
Lion is a top predator that hunts secondary consumers. Simba’s father died and contribute to the circle of life. I hope it gave you some pointers!
 
        
             
        
        
        
Answer:
The stimuli is photoreceptor
Explanation:
The fish has been conditioned to react to light so it has conditioned response 
 
        
                    
             
        
        
        
Atoms are electrically neutral because they have equal numbers of protons positively charged and electrons negatively charged.