The classification system for organisms has changed from seven levels to eight. this happened because

The modern taxonomic classification system has eight levels as Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.

The new level which has been added to the seven levels taxonomic system proposed by the Carolus Linnaeus is "Domain" which is the most inclusive group of system.

The domain system is divided into 3 forms:  archaea, bacteria, and eukaryotes which was introduced by Carl Woese in 1977 were added to the older system which did not show the phylogenetic relationships between organism as prokaryotes were evolved into two groups eubacteria and archaebacteria while eukaryotes are kept a separate group.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

i think the answer is g1

hope i

-lavira: )