Earthworms are known as 'Friends of farmers'. Give reason.

PCl_3 fumes in moist air. Give reason.

Flow of blood in vasa recta is known as counter current system. Give reason.

The structural and functional abilities of earth worms are helpful for it to become friends of farmers', Evalu- ate this statement and substantiate your answer.

Name an annelid which is a friend of farmer.

AUG is Known as the initiator codons. Give reason