THREATS There are many factors that have decreased the number and diversity of Pennsylvania's birds, but the loss of habitat has been the most pervasive and persistent cause of population declines.
(THREATS; are; ) (many factors; have decreased; the number and diversity of Pennsylvania's birds) (the loss of habitat; has been; the most pervasive and persistent cause of population declines)
THREATS many factors the loss of habitat
are have decreased has been
the number and diversity of Pennsylvania's birds
the most pervasive and persistent cause of population declines