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.  

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

is this for the e2020 class