The Importance of Freshwater Ecosystems. Water ecosystems, specifically freshwater ecosystems, are some of the most important resources in the replenishment and purification of water sources used by humans. ... One of the main functions of wetlands is to remove metals and sediments that make their way into water.
Environmental factors do influence natural selection because they can increase or decrease the population of a species, by selecting those with only favorable traits.
The answer is A: being familiar with different types of galaxies that exist in the universe