Answer:
The mechanism that Darwin proposed for evolution is natural selection. Because resources are limited in nature, organisms with heritable traits that favor survival and reproduction will tend to leave more offspring than their peers, causing the traits to increase in frequency over generations.
Explanation:
The factor given in the choices that will probably decrease population density would be C. forest fire. Normal rainfall is beneficial to the ecosystem to help grow the vegetation and in result, benefits the consumers. Predators decrease the population while birth rate can also increase population.
Carbohydrates are <span>biomolecules that contain only carbon, hydrogen and oxygen, usually in the ratio 1:2:1. They are b</span><span>iomolecules that include sugar, starch, or cellulose and serve as a major energy source in the diet of animals.</span>