Scientists agree that the universe is dynamic and it continues tochange. An adjustment in the world triggers organisms to developadaptive mechanisms to ensure their continuity. In the process, somedie out. Most of the organisms’ processes are primarily dependenton weather Thus, in the case that this variable changes, theirsurvival is threatened. Elements that change include the availabilityof nutrients, interrupted hibernation and migration, and theinability of the body systems to function optimally due to changes inclimate.
However, species can adapt to environmental changes throughevolution, but the change in climate happens too quickly for them toadjust and this leads to extinction. It is thus easier to note thatit is not the conditions that matter, but the rate at which thetransformation takes place (Martin 323). Put simply, if the change inclimate is significant enough, and on a global scale, it can be thebest ingredient to foster mass extinction.
The Cretaceous-Tertiary extinction that wiped out the dinosaurs isthe most recent phenomenon. The scenario has been studied extensivelyby scientists, and they believe that it was triggered by an asteroidthat crashed on earth leaving behind a large crater (Martin 551).Aerosols and dust that resulted were trapped in the atmosphere. Theconsequence for this was that sunlight was blocked from reaching thesurface of the earth. As a result, photosynthesis was inhibited, andmany plant species became extinct. The food chain was affected withthe herbivorous, and then the carnivorous being completely wiped outof the earth (Martin 551).
In conclusion, aspects that trigger extinction include theunavailability of water and food, interrupted migration, andlacerated functioning of the systems. The current intensive pollutionposes a danger for various species that are gradually dying out. Ifunchecked, more plants and animals il become extinct in the nearfuture.
Martin,Ronald E. Earth`sEvolving Systems: The History of Planet Earth.Sudbury, MA: Jones & Bartlett Learning, 2013. Print.