What makes a species invasive?

When it starts taking over, and disrupting the environment

Explanation:

An invasive species is a species that isnt native that that area, and vegans taking over the ecosystem and messes up the food web. When an invasive species is introduced to a habitat and starts disrupting the environment the native species start to suffer. They native species won't have as much resources available, places for homes, or they are being hunted as prey.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

substitution is the answer in this case