In the given diagram,what do the parts labeled $P$ and $Q$ represent respectively?

What is considered a species?

$A$ group of organisms with fundamental similarities is known as:

The basic unit of classification / taxonomy is

Select the correct option on the basis of the following sentences:
$I.$ Biological names are generally in French.
$II.$ The first word in a biological name represents the genus.
$III.$ The second word in a biological name is written in a capital letter.
$IV.$ When the scientific name is handwritten,it should be underlined.

Two similar holotypes are called