Plankton is part of an aquatic ecosystem
        
             
        
        
        
The plant should be insect pollinated. The bright color and the scent is used to attract the insects, therfore it is a type of plant that is insect pollinated
        
                    
             
        
        
        
The controlled experiments are performed by the scientists, when they want to study the changes in the sample on changing a single variable. So, the correct answer is option (b).
In case, all variables are kept same, no changes would be observed in the experiment sample. A controlled experiment can be performed on living thing as well as non living. But, controlled experiment cannot be performed on the things which are influenced by a lot of variables, as they cannot create realistic results. So, the option (a), (c), and (d) are incorrect. 
 
        
             
        
        
        
Answer:
<em>Granite is a type of igneous rock. What determines the size of the crystals that form in a sample of granite?
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<em>B.
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<em>how quickly the rock cooled</em>
 
        
             
        
        
        
<span>When a cell is in a dynamic equilibrium with its environment, this means that the salt/water concentration inside the cell is equal to the salt/water concentration outside the cell. It is called an equilibrium because no transport of molecules is needed since the concentrations are already the same.</span>