One adaption the garden slug or  Arion hortensis have is that lets them survive in their environment is the amount of mucus they make.  They can thrive in their environment because they can produce a lot of mucus which keeps them moist and it keeps them hydrated because its full of water and they need that to do well in an environment, they also need warmth and moisture that’s why they are mainly in gardens and fields/ forests because there warm but not burning for the too loose all their moisture. some structures of the slug that helps them survive in their environment is their mantel it helps protect their inner organs. and their mucus because it keeps them moist when they’re stuck in hotter climates.

the sword fern or Polystichum munitum is native to western North America. the species was first introduced to foreign environments by the seeds that were mixed with soil that got moved around and ended up in the foreign habitats, these ferns thrive mainly in places that are close to the water that is humidor  that is mainly moist and here in bc we have a lot of rain which keeps them moist and lets them grow. I think this plant is causing harm because there are so many of them that they are taking over most of the land. They managed to adapt to lots of different types of soils. there are some ways people used to get rid of them and that was by using a  water-soluble foliar herbicide liquid that they would spray on then pull them out.