(a) State how the constant interval environment is beneficial to organisms. (b) Explain any two alternatives by which organisms can overcome stressful external conditions.

(a) Constant interval environment is beneficial to organisms as it permits all biochemical reactions to proceed with maximal efficiency thereby enhancing the fitness of species. (b) Organisms can overcome stressful external conditions by:
Regulating internal environment by maintaining constant body temperature / osmotic concentration.
By suspending metabolic activities through hibernation / aestivation / diapause.
Organisms migrate temporarily to more hospitable areas.