Which of the following is an omnivore?

Match List $I$ with List $II$.

$A$. Natality	$I$. $\frac{dN}{dt} = rN$
$B$. Exponential growth	$II$. Death rate
$C$. Mortality	$III$. Birth rate
$D$. Logistic growth	$IV$. $\frac{dN}{dt} = rN \left[1 - \frac{N}{K}\right]$

$A$ country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations $A$ and $B$ twenty years apart. Select the correct interpretation about them.

Match the column-$I$ with column-$II$ and select the correct option given:-

Column-$I$	Column-$II$
$A$. $J$-shape curve	$(i)$ Sigmoid curve
$B$. Verhulst-Pearl logistic growth	$(ii)$ Breed only once in their lifetime
$C$. Extinction of Abingdon tortoise	$(iii)$ Competition for same resources
$D$. Pacific salmon fish and Bamboo	$(iv)$ Resources unlimited

The figure given below is a diagrammatic representation of the response of organisms to abiotic factors. What do $a$,$b$,and $c$ represent respectively?

Which process allows organisms to protect themselves during stressful environmental conditions?