19. Natural disasters, such as earthquakes, volcanoes, and forest fires are also abiotic factors that certainly have drastic effects on the ecosystem. What inference can be drawn from the statement? A All factors are caused by natural disasters. C. Humans are the main cause of abiotic factors. B. Natural disasters don't have any significant effect. D. Natural disasters should also be taken into consideration as it may result to loss of habitats.

20. Which of the following are the main conditions that determine the plant life of a given biome? A Rainfall and Temperature C. Rainfall and Sunlight B. Sunlight and Temperature D. Altitude and Temperature​