Invertebrates, much like every organism, serve a purpose and fill a niche in their biome. Humans may consider certain insects or Spiders as nuisances, but they remain necessary to do something vital. So, invertebrates are helpful.
Some invertebrate species can be harmful to people, and many of the world's most dangerous parasites are members of the invertebrate family. Some of the more well-known invertebrate parasites include ticks, fleas, and leeches. There are also parasites like tapeworms that live within the body of their hosts, and these can potentially be even more dangerous than their external counterparts. Some parasites, like mosquitoes, can be especially damaging because they can potentially carry diseases.
they help by sucking your balls
If you need help I recommend you type in the specific question you need help with
it can be helpful or harmful
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sometimes they are helpful and harmful.
Bacteria can be both harmful and helpful
Sandpaper is both helpful and harmful.
they are helpful not harmful to plants
harmful
Depends on what part of "harmful" or "helpful" you are referring to.
Helpful
helpful
helpful