Many contributing factors to the declination of the leopard frog are caused by humans, such as "habitat destruction, fire suppression, increases in ultra-violet radiation, industrial pollution, pesticides, acid precipitation, sedimentation, changes in temperature, introduction of predators or competitors into breeding areas," but there are also natural decimating factors such as diseases and natural population fluctuations (The Northern Leopard Frog ).
(Many contributing factors to the declination of the leopard frog; are caused; by humans)
Many contributing factors to the declination of the leopard frog
are caused
by humans