B. distribution of sunlight.
Answer:
The final sentence, It shows that Mateo needs to pump bubbles into the tank, and bubbles are just a gas trapped in a liquid, in this case, air in water. It shows that Mateo's fish needs the bubbles, which means it needs air.
Explanation:
I believe the weight of the object can be obtained by multiplying 5 kg to the acceleration due to gravity on earth at 9.8 or about 10 m/s^2. Which is 50 Newtons. The response I believe is C.