The diagram depicts the information about different stages involved in the development of frog

It is apparent, initially,the adult frog lays multiple eggs and an embryo is formed by eggs .Further, the embryo is converted into tadpoles which stay attached to water plants. After this, tadpoles grow bigger and they used external gills for breathing then the tale of tadpole remain growing. Further , the back legs of frog appears.

Attention towards further stages, in 7th stage, frog start taking food from tail . Further, the front legs start appearing and the tail of frog becomes shorter. Further, the frog developed into a young frog and finally become a adult frog and process continuous.

Overall, be analysed that it is not a man made process. So, all the steps should be take place accordingly.