A sponge harmful to oyster industry is
Cliona
Euspongia
Hyalonema
Spongilla
A.
Cliona
Boring sponges, such as Cliona, attach themselves to shells of oysters, clams, barnacles etc, boring them so full of holes that their contained animals are destroyed and in time, the shells are entirely broken up. Lime of these shells gets dissolved into sea water to be used over again by other animals. Sometimes, these boring sponges may prove great nuisance to oyster beds.
A man of 'A' blood group marries a woman of 'AB' blood group, which type of progeny would indicate that man is heterozygous ?
O
B
A
AB
Eustachian canal connects
middle ear with external ear
middle ear with internal ear
external ear with internal ear
pharynx with middle ear
