Question

in the following foodchain ,grass provides 4000j of energy to the grasshopper.how much energy will be available to snakes and frogs? grass > grasshopper > frogs > snakes

Answer 1

u can apply 10℅law and snakes have4j and frog have 40j

Answer 2

if grass provides 4000j energy then it will give 10% of its energy to the next trophic level.so, by this 

grass -4000j , grasshopper-400j, frogs -40j snakes-4j 

so 4j and 40j energy would be available for snake and frog respectively.