The phrase 'demonstrate their needs' is correct and can be used in written English.
You can use it when referring to a group of people who are displaying, or showing, their needs in some way. For example, "The children demonstrated their needs by drawing pictures of what they wanted."
In addition to those, he said, opponents must understand how wireless companies demonstrate their need for the towers.
This audience demonstrated their need through behavior: They either stopped, or dramatically reduced their online payment activity.
Some years ago, an experiment was done upon baby chimpanzees to demonstrate their innate need for a maternal presence.
While students need to demonstrate their specialty, they also need to show their personality.
Public health staff used to thinking in terms of policies which will take many years to demonstrate their effectiveness will need to understand how the three or four-year electoral cycle dominates the thinking of their political bosses.
Over the years, many services now provided in Quebec home-care programs became entrenched without having to demonstrate their efficacy in responding to needs related to disabilities.
The finance minister, Jin Nyum, however, said companies would need to demonstrate their commitment to change.
"Japanese companies realized they needed to demonstrate their ability to change, and maybe more importantly, Japanese society began accepting outsourcing".
Natasha suggests that in order to fulfil their potential and demonstrate their worth, organisations like Hale need to join forces.
While boys need to demonstrate their status by publicly vanquishing rivals, girls prefer to use "acts of shunning, stigmatizing and gossiping," she explained.
Men who don't need to demonstrate their physical dominance privately, when they're unable to match their women's achievements in the public sphere.
