Suggest why the efficiency of energy transfer between the phytoplankton and fish is very low

Some parts not eaten/indigestible ;

lost in feces /waste/excretion ;

energy loss in movement ;

heat loss in respiration

i don't know. the other person does though.

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.