Complete the missing links:
The DDT is a ______ pollutant.

Complete the missing links: DDT is a serious pollutant as it is a ________ pollutant and undergoes--------------.

Complete the missing links: COD stands for _________

Complete the missing links: A heavy metal pollutant released in automobile exhaust is ________

Complete the missing links: The __________ is the cavity of gastrula

Complete the missing links Stalk of ovule is called_____

Complete the missing links: The electric power plants cause ________ pollution.

Complete the missing links: Rapid increase in human population is called…………………

Complete the missing links Frog is_________while human female is_____

Complete the missing links: Secondary treatment for polluted water are _________ and activated sludge method.

Complete the missing links: Cadmium pollution caused _______ disease in Japan.