Plants which produce characteristic pneumatophores and show vivipary belong to

What percentage of organisms are conformers (in $\%$)?

Ecological hierarchy comprises which of the following sequences?

Organisms which can tolerate and thrive in a wide range of temperature are called .......... e.g. .........

Assertion $A$: Aquatic organisms do not experience mechanical shocks while swimming in water.
Reason $R$: Water is a liquid medium for swimming.
Which option is correct for Assertion $A$ and Reason $R$?

The region consisting of long and severe winters and a growing season consisting of a few months of summers constitutes: