The static concept of species was put forward by

Genus represents

Which of the following statements is consistent with the taxonomic category 'Family'?

Which group of species belongs to the same genus?

Who published the book 'Species Plantarum' and provided a basis for the classification of plants?

In which of the following pairs of categories is it more difficult to determine the relationship to other taxa at the same level,thus making the problem of classification more complex?