The aquatic organism that can actively swim at will against the water current is

Match the following types of adaptations in Column-$I$ and Column-$II$.

Column-$I$	Column-$II$
$i$. Morphological	$a$. Crassulacean Acid Metabolism
$ii$. Physiological	$b$. Migration of birds
$iii$. Behavioural	$c$. Leaves reduced to spines in Opuntia

$A$ biotic community is an assemblage of different .......,whereas the biosphere is an assemblage of all ........

Just as a person moves from Delhi to Shimla to escape the summer heat,where do thousands of migratory birds migrate from the extremely cold regions of Siberia and the North Pole?

Warm-blooded animals like mammals from colder climates generally have shorter ears and limbs. This is an explanation of:

Give one example for each of the following:
$(i)$ Eurythermal plant species: $................$.
$(ii)$ $A$ hot water spring organism: $................$.
$(iii)$ An organism seen in deep ocean trenches: $................$.
$(iv)$ An organism seen in a compost pit: $................$.
$(v)$ $A$ parasitic angiosperm: $................$.
$(vi)$ $A$ stenothermal plant species: $................$.
$(vii)$ Soil organism: $................$.
$(viii)$ $A$ benthic animal: $................$.
$(ix)$ Antifreeze compound seen in Antarctic fish: $................$.
$(x)$ An organism which can conform: $................$.