Moving from species towards kingdom,the variation is ......... and the number of species ......... .

Which of the following is the only taxonomic category that has a real existence?

Different taxa at the same level are exemplified by:

Which of the following statement$(s)$ is/are true?
$A.$ An organism represents/occupies a place or position in the system of classification.
$B.$ One specific epithet may be present in different genera representing different species.
$C.$ Human belongs to $Homo$ species.
$D.$ Animals,mammals,and dogs represent the taxa at the same level.
Options:

Genus is a group of similar and related

Who is known as the father of taxonomy?