Aspecies whose introduction does or is likely to cause economic or environmental harm or harm to human health

Invasive species

Explanation:

Invasive species can be described as species which are not present in the natural ecosystem of a particular place. when these species are introduced in a location, they might cause damaging effects to the environment or humans. Invasive species are a serious threat fro many naturally stable communities. An invasive species can be any type of organism that might harm a community. Common examples of the invasive species are the killer algae.  

answer; /// the correct )

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.