The figure given below is a diagrammatic representation of the response of organisms to abiotic factors. What do $(i)$,$(ii)$ and $(iii)$ represent respectively?

What type of human population is represented by the given age pyramid?

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$A$. Logistic growth	$I$. Unlimited resource availability condition
$B$. Exponential growth	$II$. Limited resource availability condition
$C$. Expanding age pyramid	$III$. The percent individuals of pre-reproductive age is largest followed by reproductive and post-reproductive age groups
$D$. Stable age pyramid	$IV$. The percent individuals of pre-reproductive and reproductive age group are same

Choose the correct answer from the options given below:

Death is important because it ......

Which of the following statements is correct?
$I.$ In a population,birth rate and death rate refer to per capita births and deaths,respectively.
$II.$ In nature,we rarely find isolated single individuals of any species.
$III.$ The size of a population for any species is a stable phenomenon.
$IV.$ Ecological effects of any factors on population growth are generally reflected in its size/population density.

Match the following and select the correct option.

$A.$ Earthworm	$(i)$ Pioneer species
$B.$ Succession	$(ii)$ Detritivore
$C.$ Ecosystem service	$(iii)$ Natality
$D.$ Population growth	$(iv)$ Pollination