Which of the following statement(s) about taxonomical aids is/are true?
I. $\quad$Keys are used to identify plants and animals based on similarities and$\quad$$\quad$$\quad$$\quad$dissimilarities
II.$\quad$ Flora contains the account of habitat and distribution of plants in a given area
III. $\quad$Flora provide an index to the plant species found in a particular area
IV. $\quad$Monographs provide information for identifying the species found in an area
These organisms also differ in size, color, habitat, physiology, and morphology.
Biologists have developed certain rules and principles supplementary which are helpful in the identification, nomenclature, and classification of organisms.