Life Cycle of a Frog How does a tadpole grow into a frog? Here is the life cycle of a frog.An adult frog lays eggs (产卵) in the water.After 6 to 21 days, the egg hatches (孵化). It becomes a tadpole. The tadpole lives in the water. It has a long tail,and it uses the ta...
Ten headwater creeks were surveyed for tailed frog tadpoles in the summers of 1994 and 1995 to assesspossible effects of timber harvest on their population... TR Wahbe 被引量: 29发表: 1996年 How does a tadpole know when to metamorphose? A theory linking environmental and hormonal cues Tadpol...
7.Baby animals are magical---they grow and (41)D adults in fantastic ways.A tadpole grows legs and turns into a frog.A downy chick becomes a smooth-feathered hen or cock.Often baby animals look quite different from their(42)B.But what makes them loo