Q1.
the young stages of frogs are called tadpoles. the tadpoles live in fresh water.
the drawings show a tadpole just before hatching and three days after hatching.
structure x in the exchange of substances between the tadpole and the water.
structure x
tadpole just
before hatching
tadpole three days
after hatching
(a)
name one substance, other than food, that the tadpole needs to exchange with the
water in order to grow.