Effects of Species Extinction on The Ecosystem Environmental pollution (Death of marine bird due to oil pollution). causes of extinction: habitat loss, an introduced species, pollution, population growth, and overconsumption. Given that it took place over a huge span of time—estimates range from 500,000 to 25 million years—it isn’t possible to point to a single cause for the Devonian extinction, though some suggest that the amazing spread of plant life on land during this time may have changed the environment in ways that made life harder, and eventually impossible, for the species that died out. Extinction Animal Extinction Causes and Effects - Paypervids Read more Information. Indigenous plants and animals are fully acclimated to their surroundings. 7 events that could cause mass extinction on Earth Human activities – e.g. mass extinction What causes black spots on deer? What Causes Extinction & How Can We Prevent Species Extinction ...