The classification levels of a human are listed below from largest to smallest.
eukarya
animalia
chordata
mammalia
primates
hominidae
homo
sapiens
which level of biological classification do mammalia and hominidae represent, respectively?

a)class and family

b)order and class

c)family and species

d)species and kingdom

Ans.

Biological classification of a species, there are eight levels from largest to smallest, which include domain, kingdom, phylum, class, order, family, genus, and species.  

According to this classification system, modern humans can be classified as:

Domain (Eukarya), Kingdom (Animalia), Phylum (Chordata), Class (Mammalia), Order (Primates), Family (Hominidae), Genus (Homo), Species (sapiens).

Thus, levels of biological classification, represented by Mammalia and Hominidae are class and family, respectively.

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.

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.