Concept:Rainfall is a major abiotic factor because it controls water availability, which determines the types of organisms that can survive in a habitat.
Explanation:Water is essential for life, and rainfall decides how much water is present in a habitat.
Areas with high rainfall support forests, while low rainfall areas support grasslands or deserts.
This difference in vegetation directly affects the distribution of animals and other organisms.
Although salt, pH, and light also affect organisms, rainfall has a wider and stronger influence on distribution, especially in terrestrial habitats.
Answer:D. Rainfall
