I've been stuck on how to reword all this can anyone help?

"An invasive species is non-native to the ecosystem in consideration and causes or is likely to cause economic or environmental harm or harm to human health."

This is what I have so far but I'm not sure if it's any good- Invasive species are just one of many things that can disrupt and drastically change and ecosystem. They are non-native organisms, whose introduction can cause or is likely to cause harm to the economy, the environment and its inhabitants.

2 answers

It's pretty good.
I'd make a couple of changes, though.

Invasive species are just one of many things that can disrupt and drastically change an ecosystem. They are non-native organisms, whose introduction is likely to cause harm to the economy, the environment and its inhabitants.

Note the words I deleted.
I would not reword it, but quote it (and cite the quote). Otherwise, your rewording is ok.
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