At present their are about thirty animal phyla, of which ten are major and twenty are minor phyla then, which are those minor phyla??

the eukaryotic ribosomes are of 80S type and the prokaryotic ribosomes are of 70S type ,what is 'S' ??? and in the book it was given that, Each prokaryotic ribosomes of 70S is composed of two sub-units: 50S and 30S., but 50 +30= 80 then how...........?

name type of muscle fibre lining the stomach and intestine

describe ultra structure of mitochondrion