What percentage of fish spcies live in freshwater ecosystems? a. 30% b 40% c. 45% b. 35%

I say about 40 percent cause say something like this ..

20% of small species of fish

20% of big species of fish

to be equal

20% are bigger

20% are smaller

hoped this helped !

~Frozen 2

answer; ///i believe that the correct answer is (a) specialized cells)

not sure if this what   you'r looking for would be percent composition