The most important feature of all living systems is to

Mark the incorrect statement $w.r.t.$ metabolism.

Reproduction is synonymous with growth in

Match the following columns based on the scale of biological organization and their respective fields of study:

Column $I$ (Scale)	Column $II$ (Biological Entity)	Column $III$ (Field of Science)
$a$. Macroscopic	$P$. Ecosystems	$i$. Physics
$b$. Sub-microscopic	$Q$. Tissues	$ii$. Ecology
$c$. Conceptual	$R$. Organ systems	$iii$. Cell Biology
$d$. Microscopic	$S$. Sub-atomic particles	$iv$. Biology

Statement $A$: The number of individuals of each species remains limited due to death.
Reason $R$: Due to death,the materials forming the body of living organisms return to the environment.
Which option is correct for Statement $A$ and Reason $R$?

$A$ true species consists of a population that is: