I'm sure the answer is diffusion
        
             
        
        
        
Answer:
The magnets are placed side by side with the opposite poles of each magnet near the other (Option D/Option 4)
Explanation:
The two moved towards eachother when released, and that will only happen the opposite poles are facing eachother.
Sorry if this doesn't make much sense.
 
        
                    
             
        
        
        
Answer:
10
Explanation:
atomic mass is protons + neutrons
19 = 9 + neutrons
10 = neutrons
 
        
             
        
        
        
An ecosystem involves both the biological (plants, animals, human beings) and non-biological (land, water, soil, and atmosphere) community which interacts as a system. More importantly, the living things are very dependent on the abiotic community since it cannot survive by itself. Every animal, plant and human needs the primary physiological needs of water, food and shelter provided by the abiotic system.  
POND
ROCKS
MOUNTAINS
DEAD ANIMALS PLANTS AND WASTES ARE NOW ABIOTIC FACTORS
        
             
        
        
        
Answer:
E.
Explanation:
The first filial generation, will have 4000MN, while the progeny of the new Haldane population will be in the second filial generation 1000 MM + 2000 MN + 1000 NN.