Origin of Species by Means of Natural Selection - Assignment Example

Based on the significant evolutionary development that has taken place on Earth, the organisms that have contributed a lot to the evolutionary changes are the simple organisms. According to Darwin’s theory, multi-cellular and high organisms are thought to have evolved from simple organisms (Darwin, 1859). Indeed, it could be argued that such simple organisms continue to undergo evolution, considering the emergence of new strains of viruses and bacteria that threaten human health. For example, it is widely concurred that Malaria causative agents have noticeably evolved to become drug resistant.

Response to Question 3

The new exotic organisms are accompanied by far-reaching implications on the ecosystems. Most commonly, these organisms have altered food chains and food webs through increased competition, as well as their harmful activities on the environment. The impact of such organisms on human beings can also be speculated based on the food web relationships. If one component of the food web is altered or threatened, the impact is transferred to the rest of the organisms in the ecosystems, including human beings. The impact may always be direct but comes with profound consequences, such introduction of toxins to the environment, which get to the human body through the food chains (Cronon, 2005).

Response to Part 4

Becoming a vegetarian has also some implications for the environment. One is that vegetable dependency deprives the ecosystems of the primary producer capacity to cater to the ecosystem's needs, such as carbon dioxide recapture. Secondly, over-reliance on vegetables could be harmful because it concentrates only certain forms of energy in the body, which could be harmful. Lastly, vegetables alone are not adequate for a balanced diet. One misses out on essential nutrients such as animal proteins that are crucial for the body's functioning.

Response to Question 5

The most convenient sources of energy are hydroelectric power. Currently, a lot of emphasis is being laid on green energy sources. These are those that are not only sustainable but have a limited impact on the environment. In addition, these are available and reliable for use on a large scale (Cronon, 2005). The rest of the energy sources such as coal or wood are not sustainable because they pollute the environment.