Question

Make a list of animals / birds seen 30years ago write few reasons for their disappearence.

Answer 1

sparrow,vultures,e.t.c. are the birds which seen 30 years ago. now they are dissapeared.
this is because radiation is the main reason for disappearence of sparrows and chemical  is used to feed cattle.when cattle died this was eaten by vultures are die

Answer 2

a dog , it was taken by municipal people