How is demography helpful?

yes they are. they help spread pollen throughout this world.

Anything that will benefit you can be considered helpful.

help people when they need and do people favors ya.. help people when they need and do people favors ya..

Houseflies are not helpful as per the information known till know but they are vector of about 100 of causative organism of diseases like cholera, typhoid, anthrax , bacillary dysentery, opathalmia...

ne helpful organism is the brain. The brain controls your body to do what, and when.a helpful organism is a centipede it feeds on nematodes and aphids which are enemies to farmers