Q: Fact 1: Planting trees has a positive impact on an ecosystem. Fact 2: Destruction of Trees is taking place, pollution of air is the Result of cutting trees with pace. Given the two facts above, what has a positive effect on an ecosystem?

Available choices: * maintaining air pollution. * removing habitats. * stopping air pollution. * to stay warm. * in the frog family. * Electric generators. * increasing air pollution. * genetic diversity.
The answer is:
stopping air pollution