The Answer is the Intertidal Zone
Answer:
Eleven islands make up 95 percent of the Philippine landmass, and two of these — Luzon and Mindanao — measure 105,000 square kilometers (40,541 sq mi) and 95,000 square kilometers (36,680 sq mi), respectively.

They would constrict the diameter of blood vessels. Plaque and tobacco can block your arteries, inhibiting from doing their job.
I believe the correct answer is natural selection.
Natural competition and the fight for “survival of the fittest” is what pushes diversity the most.