How are scientific names of plants and animals assigned?

The order $Primata$ contains:

Which knowledge is essential for identifying the recognized organisms?

Which taxonomic term may be suggested for any rank in the classification?

Which of the following forms a taxonomic category?

The common taxonomic categories are given below. Arrange them in the correct sequence starting from the smallest unit:
$(i)$ Genus $(ii)$ Family $(iii)$ Species $(iv)$ Order $(v)$ Subspecies