Housefly feeds on sugar by

In the given figure,what do $A$ and $B$ represent respectively?

Which is the correct sequence of labeling for the given figure?

In cockroach,the development is paurometabolous,meaning that development occurs through the nymphal stage. The nymph grows by moulting about $13$ times to reach the adult form. The metamorphosis process in cockroach requires approximately how many days?

The body cells in cockroach discharge their nitrogenous waste in the haemolymph mainly in the form of

Define the following terms:
$(i)$ Vermicomposting
$(ii)$ Haemolymph