Frogs are a marker of water quality because they lay their eggs in water and spend the early stage of their life in water as tadpoles.
(Frogs; are; a marker of water quality; because they lay their eggs in water and spend the early stage of their life in water as tadpoles) (they; lay; their eggs; in water) (they; spend; the early stage of their life; L:in water; as tadpoles)
Frogs they they
are lay spend
a marker of water quality because they lay their eggs in water and spend the early stage of their life in water as tadpoles
their eggs in water
the early stage of their life L:in water as tadpoles