This means that they start their life in the water as tadpoles, or pollywogs, with gills.
(This; means; that they start their life in the water as tadpoles, or pollywogs, with gills) Context(This means,List([0, 10))):(they; start; their life; L:in the water)
This means,List([0, 10))
This they
means start
that they start their life in the water as tadpoles, or pollywogs, with gills
their life L:in the water