A(n) solution can dissolve more solute at the given temperature. If you add more solute until the solution will dissolve no more at that temperature, it is . *

An unsaturated solution can dissolve more solute at the given temperature. If you add more solute until the solution will dissolve no more at that temperature, it is saturated solution.

Explanation:

In unsaturated solution, there is capacity of solution to dissolve more solute inside the solution. In saturated solution, there is no capacity of a solution to dissolve any further solute at a given temperature. This capacity is increased by heating the solution so more solute will be dissolved. This is called supersaturated solution.

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.