Answer:
pets can help boost your mood 
Explanation:
if you do not have any pets you could have slight depression if there is no one to cheer you up such as your companion
 
        
             
        
        
        
Carbon dioxide is the compound in photosynthesis, I'm pretty sure
        
                    
             
        
        
        
Cell - neuron, egg, bacteria, perenchyma
tissue - bone
organ - leaf, flower, eye
organ system - blood, human skeleton
organism - mushroom, bear
not 100% sure but tried
        
             
        
        
        
Answer:
conditioned response
Explanation:
The conditioned response, in classical conditioning, is the learned reaction that is elicited by an organism to a previously neutral stimulus, which is now a conditioned stimulus.
In the experiment of Pavlov, where the dog was taught to salivate by presenting food and the sound of the bell at the same time, the dog learns to salivate at the sound of bell alone even without food. This response of the dog is termed a conditioned response to a conditioned stimulus (sound of bell).
 
        
             
        
        
        
The structures that are founded in prokaryotic cell are; capsule , cell wall , call membrane or plasma membrane, pili, flagella, ribosomes, plasmids, and nucleoid region.