As invasive species, how does the introduction of the feral pig and the water hyacinth impact an ecosystem?

Found in many parts of the world, the feral pig damages crops by trampling and "rooting." It attacks and feeds on livestock (mainly lambs) and causes the spread of weeds. It also spreads diseases such as leptospirosis and foot-and-mouth disease. Feral pigs feed primarily on plants but also on earthworms, insects, amphibians, reptiles, and birds. The water hyacinth spreads at extremely fast rates, in favorable conditions doubling its numbers in as little as 12 days. The plant, which floats on the water's surface, can cover large areas, thus limiting boat traffic, swimming, and fishing. By blanketing the surface, the plant also prevents sunlight from entering the water. Moreover, when it dies, the decaying plant matter robs the water of oxygen. The reduced amount of sunlight and oxygen in the water disrupts plant and animal life, adversely affecting the habitat's biodiversity.

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.