Many factors may cause the need for a species to be listed as threatened or endangered, but the principal factors are associated with human impacts and species habitat destruction.
(Many factors; may cause; the need for a species) (a species; to be listed; as threatened or endangered) (the principal factors; are associated; with human impacts and species)
Many factors a species the principal factors
may cause to be listed are associated
the need for a species
as threatened or endangered
with human impacts and species