The eurasian water milfoil is a nonnative
species, which was once commonly sold as an
aquarium plant, and is now found growing in
many lakes in new york state. it has few
natural enemies, and grows rapidly, crowding
out many native species. this plant ruins fishing
areas and interferes with boating and other
water sports. this is an example of
(1) human consumption of finite resources
(2) an unintended consequence of adding an
organism to an ecosystem
(3) an abiotic factor having a negative effect on
an ecosystem
(4) the introduction of a species that has
increased the long-term biodiversity of an
ecosystem