Me wizards of biology an example of a detritivore would be a. a cow eating grass b. a hawk capturing a mouse c. a colony of ants eating a grasshopper

None of these are examples of detritovore.  A cow eating grass is an example of herbivore.  A hawk capturing a mouse and ants eating a grasshopper are both examples of predation.  I suspect the answer they are looking for is C, but that would only be accurate if the grasshopper were already dead before the ants got to it.  Basically, detritovores are organisms that eat dead things.

the bald eagle got 50 because everything gets 10% of what they consume and since 50 is ten % of 500 hundred that means the   grasshopper had to have consumed a plant with 5,000 calories of energy