What is the difference between class and clade? Group and genus?

is that genus is a rank in the classification of organisms, below family and above species; a taxon at that rank while clade is a group of animals or other organisms derived from a common ancestor species. a

AND

The main difference between species and genus is the taxonomic rankings that are used for biological classifications of organisms. Genus belongs to a ranking lower than family and above species, whereas species are organisms with similar characteristics that come below the Genus classification ranking.

when it's short and dry.

well

explanation: