Biological structures like DNA, proteins and cells all depend on molecules. ... Neurotransmitters like epinephrine are pretty simple molecules, but without them our nervous system couldn't work. Oxygen, containing just two oxygen atoms, is a very simple molecule, and it is certainly essential to living things. 
 
        
                    
             
        
        
        
Answer:So yes,humans and other mammals (like dogs) have same immune system. Differences may occur in the protein structures, but they all come in same family and work similarly like humans.
Explanation: Are animal immune systems different from humans? - Quora
https://www.quora.com/Are-animal-immune-systems-different-from-humans
 
        
             
        
        
        
Answer:
eukaryotic cell
Explanation:
because prokaryotic cells lack nucleus 
 
        
                    
             
        
        
        
Answer:
66.7m/s²
Explanation:
initial velocity(V)=54m/s
Final velocity(U)=4m/s²
Time taken(t)= 0.75 seconds
Acceleration is unknown
To find the acceleration we use this formula
a=v-u/t
a=54-4/0.75
a=50/0.75
a=66.666666
since it is acceleration we use the symbol m/s² after approximating to 1 decimal place
a=66.7m/s²
rate The answer as brainliest
 
        
             
        
        
        
Answer: 
c. Biosphere 
Explanation:
The biosphere, also known as the ecosphere, is the worldwide sum of all ecosystems. It contains all living things above and below the surface of the Earth.