Assertion $(A):$ A person goes to high altitude and experiences 'altitude sickness' with symptoms like breathing difficulty and heart palpitations.

Reason $(R):$ Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen.

In the light of the above statements, choose the correct answer from the options given below.

How do organisms living in different habitat manage with stressful conditions?

If a fresh water fish is placed in an aquarium containing sea water, will the fish be able to survive ? Explain giving reasons.

The process of laterization results into