Based on the levels of organization in biological sciences,what does the part marked '$P$' represent?

Select the correct option for the following statements:
$(i)$ The basic unit of classification is species.
$(ii)$ Budding is observed in yeast and Hydra/Planaria.

Choose the correct statements:
$(i)$ Growth cannot be taken as a defining property of living organisms.
$(ii)$ Dead organisms do not grow.
$(iii)$ Reproduction cannot be an all-inclusive defining characteristic of living organisms.
$(iv)$ No non-living object is capable of replicating itself.
$(v)$ Metabolism in a test tube is non-living.
$(vi)$ Metabolism is a defining feature of all living organisms.

Assertion $(A)$: Theophrastus classified plants into four groups based on their habit.
Reason $(R)$: This Greek naturalist is known as the Father of Botany.

Study the four statements $(A-D)$ given below and select the two correct ones out of them.
$A.$ Definition of biological species was given by Ernst Mayr.
$B.$ Photoperiod does not affect reproduction in plants.
$C.$ Binomial nomenclature system was given by $R$.$H$. Whittaker.
$D.$ In unicellular organisms,reproduction is synonymous with growth.
The two correct statements are:

What is the essential requirement for a student of taxonomy?