Which of the following represents an organism and its ecological niche correctly?

$I.$ Biochemical adaptations are seen in organisms living at great depths of the ocean to face crushing pressure.
$II.$ Allen's rule explains adaptations in mammals living in colder climates.
$III.$ Altitude sickness is caused because the body does not get enough oxygen due to low atmospheric pressure at high altitudes.
$IV.$ Desert lizards lack behavioural means to manage their body temperature.
Choose the correct option for the above statements.

Community is a group of independent and interacting population of

The treeless biome of cold climates is:

Where are tuna fish found in the ocean?

Savannas are .....