Testable questions: How will the grass growth rate affect the rabbits? Questions:
what is the manipulated variable, responding variable and the constant?

the manipulated variable is the growth rate of the grass, or the amount of food the rabbits have. the responding variable is the rabbits themselves. the constant is everything else in the scenario. the environment, the predators, etc.

the bullets go in this order.

4, 1, 3, 5, 2

the supermassive black hole is in the middle of the galaxy.