Which of the following phenomena does not play a significant role in the maintenance of homeostasis in an ecosystem?

$X$ - In deep-sea hydrothermal vents,the average temperature is between $25^{\circ}C$ to $30^{\circ}C$.
$Y$ - Reptiles and amphibians are eurythermal.

$A$ 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 List-$I$ with List-$II$.

List-$I$	List-$II$
$(a)$ Allen's Rule	$(i)$ Kangaroo rat
$(b)$ Physiological adaptation	$(ii)$ Desert lizard
$(c)$ Behavioural adaptation	$(iii)$ Marine fish at depth
$(d)$ Biochemical adaptation	$(iv)$ Polar seal

Choose the correct answer from the options given below.

Match Column-$I$ with Column-$II$ and select the correct option.

Column-$I$	Column-$II$
$(a)$ Mutualism	$(i)$ Potent force of organic evolution
$(b)$ Orchid	$(ii)$ Negative interaction
$(c)$ Parasitism	$(iii)$ Beneficial interaction
$(d)$ Competition	$(iv)$ No harm to the host

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