2. Use the term “concentration” in a sentence about liquids that conveys its meaning..

The concentration in this apple juice just makes the taste very strong and powerful, the taste comes out perfectly.

Explanation:

- decrease the number of plants and animals living in the water.

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.