Answer: Option 4.
The fresh water is hypotonic and the salt solution is Hypertonic.
Explanation:
Hypotonic solution is a solution that have little dissolved solutes i.e low osmotic pressure compare to other solution. When a cell is put in hypotonic solution, it take in water and the cell swell up and it does not burst due to it's cell wall thereby becoming turgid or hard.
Hypertonic solution is the solution where the concentration of solute is higher outside the cell than inside the cell. Example is saline water.when a cell is placed in Hypertonic solution it will shrinks because it losses water.
 
        
                    
             
        
        
        
1 possible future is The Big Crunch. This theory assumes that the average density of the universe will be enough to stop its expansion and begin contracting.
2. Some theorists state that the expansion of the universe will go on forever, and if that happens, the universe will cool as it expands, and then it will become too cool to sustain life.
3. The Big Rip. The universe may keep expanding, as I mentioned before. But as it expands, the gravity may not be able to hold all the planets together, as it is now. Galaxies would tear apart first, followed by smaller black holes, planets and stars. Eventually, space would start expanding faster than the speed of light, and atoms would start breaking down into super small particles and everything would fall into nothing.
 
        
             
        
        
        
<span>The primary desired therapeutic effect of mannitol is the reduction of intracranial pressure. This pressure, most likely caused by swelling on the brain, is generally caused by head traumas and can be life threatening. The administration of mannitol reduces this swelling thus decreasing the cranial pressure.</span>
        
             
        
        
        
Answer:
Those individuals survive which are the best ones and are adapted to their environment. Their survival is due to the possession Of adaptations. 
Explanation: 
Those organisms which are survive in the harsh environment, it is mainly due to some adaptations which helps them to survive in an environmental condition which are not suitable for them and those organisms are removed from the environment which have no adaptations capabilities. 
 
        
             
        
        
        
Oxygen gas contributes to the green house effect