It does not take part in excretion in cockroach

Heart of cockroach is........

Delete odd one.

Which of the following statement(s) is/are correct regarding excretory system of cockroach?

$(i)$ Excretion is performed by malphigian tubules.

$(ii)$ They absorb nitrogenous waste products and convert them into uric acid which is excreted out through hindgut.

$(iii)$ In addition, fat body, nephrocytes and urecose glands also help in excretion.

Give scientific reasons : In cockroach well developed respiratory system is seen.

Explain the structure of brain and neuron of cockroach