Scientists wanted to cultivate fish in a closed system. what features should be included to ensure a closed system?
a.) allow incoming water from groundwater wells
b.) allow only one species of fish
c.) prevent precipitation from entering the tanks
d.) remove solid wastes produced from the fish in the tanks

C.) Prevent precipitation from entering the tanks

A closed system is a physical system which does not exchange any matter with it's surroundings. Prevention of precipitation from entering the tanks will prevent addition of matter (water) in the close system in which the fish is being cultivated.

answer; a male inherits only one allele of the x-linked gene controlling hair color;

answer: c

explanation: