Are Humans Still Evolving Essay

The contemporary theory of evolution based on diverse evidence from the scientific field is widely accepted though contentious in a social context when applied to human beings. To date, the evolution theory has been applied to understand variation in human beings in multiple ways. The most infamous use had been used to justify ideas of racism and prejudice. Nonetheless, archaeological evidence has demonstrated that all human beings share a common ancestor. Therefore, humans display massive genetic unity compared to other species, which has resulted in many assuming that evolution demised with the origin of modern humanity. However, the diversity that is exhibited within the human species remains to be answered.

  • Is evolution still a driving force behind human diversity?
  • Is natural selection behind the evolution of humans?
  • Is human diversity a result of genetic drift?

Are humans still evolving?

Although, when we think of human evolution, we look back to natural selection, it remains a common understanding that humans evolved years ago. Yet, research suggests that regardless of industrialization and modern technology, humans progressively continue to grow. In this light, it should be noted that researchers have shifted from attaching value to biological aspects to comprehending the underlying physical and adaptive mechanisms that control diversity in an attempt to answer the questions.

With this regard, over the years, humans have used multiple mechanisms to control, modify and adapt to the natural environment.  Adaption in its simplest form is a mechanism that necessitates humans to mediate stresses in their environment to enhance reproduction and survival. While adaption can occur genetically, conceivably, adaption can also occur as a genetic modification in behavior in response to an evolving environment.

For the most part, behavioral flexibility cannot accommodate change; as such humans have an array of psychological and physiological mechanisms that help them to respond to the evolving environment without the need for genetic adaption, for instance, adaptive changes in the rate of respiration, heart rate and fat accumulation in the body. If the environment is evolving, indeed, nothing remains static; humans are evolving faster than before from dimensions, genetics, and environment.  Part of the answers lies in our genes and the sequencing of the human genome. Scientists can compare genes from diverse humans and exhibit how far we have evolved from each other. Dr. Pardis Sabeti, a geneticist at Harvard University, says that “We are living records of our past,” “And so we can look at the DNA of individuals from today and get a sense of how they all came to be this way.”

An obvious example is skin color; we have evolved to have diverse skin colors with various skin tones. Another area of recent evolution lies in our metabolism. Research indicates that our metabolism has developed with time to digest food that we were once unable to.

The gene that regulated humans’ ability to digest lactose shut down about 10,000 years ago before farming was even invented. However, today the rate of lactose tolerance is different in diverse parts of the world, apparently higher in places with histories of dairy farming! Perhaps the strangest human evolution lies in the ability to withstand infectious diseases. Millions of people die each year as a result of infectious diseases. Yet, some still survive and are more likely to evolve the gene to their offspring.

A good example is susceptibility to HIV. Scientists propose that a variant in the genes of some individuals completely protects them against HIV. This is evidenced in Europe more than it is in Africa. The origin of the variant dates to the 1970s, years before the AIDS epidemic. This variant had likely been naturally selected, as humans in these areas evolved protected against viral infections.

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Essay Sample On: Positive And Negative Effects Of Marijuana

Has it become extremely challenging to come with an essay on effects of marijuana! then our sample essay on positive and negative effects of marijuana will help you. How will it be of significance to you? If you are unable to write good ideas then you have an opportunity to pick facts on marijuana from the sample paper. In the end, you will notice that it is a good piece that you can follow your own writing. However, do not submit it as your paper or directly copy paste ideas from this marijuana essay. Traditionally, good essay writers write interesting essays to their readers from scratch. Therefore, write a good essay about positive and negative effects of marijuana by reading through the sample essay

What Are The Positive and Negative  Effects of Marijuana?

Marijuana is a psychotic drug that comes from the cannabis plant. Primarily, the drug effect of marijuana stems from its chemical property delta-9-tetrahydrocannabinol(THC). Generally, marijuana can be ingested in foods, smoked or vaporized. Scientific researchers suggest that the concentration of the chemical property THC has been increasing in the plant over the years.

Uses of Marijuana In Medical Field 

Apparently, research suggests that plant extracts are very potent. Although the use of marijuana is illegal in US, marijuana continues to be used for both recreational and medical purposes. Polarized opinions exist as the legalization of marijuana. Probably, the most controversial aspect on the marijuana debate lies in whether marijuana should be legalized for medical purposes.

Aside from the medical field, many people argue that marijuana should be legalized for both industrial and environmental benefits as well as a source of revenue. On the medical side, numerous researches have been reported to support legalization of the same.

Marijuana has been used as a pharmaceutical drug in the treatment of cancer patients, Crohn’s disease, Parkinson’s disease, Hepatitis C, AIDS, epilepsy, glaucoma and even arthritis.

Marijuana helps relieve pain, ease nausea, stimulate appetite and also control vomiting in patients. Proponents also support its use in psychology. As a matter of fact marijuana is less toxic and expensive in comparison to other alternative treatment. It’s apparent that the benefits of marijuana in medicine are quite overwhelming. However, like all medicines, the use of marijuana in medicine have been shown to have long and short term side effects both known and unknown.

Positive an Negative Effects of Marijuana

A well-established effect of smoking marijuana is the enhancement of a sense of euphoria combined with laughter and increased talkativeness that is usually followed with periods of sleepiness and lethargy.  The feeling of ‘high’ is a characteristic feature of marijuana. It results in distortion, mostly associated in deficits in learning and short term memory.

Typically, a marijuana smoker has an enhanced sense of emotional and physical sensitivity plus a feeling of high interpersonal cohesiveness. Generally, the ‘high’ that is  linked to marijuana is not actually claimed to be of therapeutic  benefit in medicine, but, reduction of anxiety, enhancement of moods plus mild sensations are desirable characteristics in medications especially for patients suffering from anxiety and pain. As such, even though, psychological use of marijuana presents side effects in treatment of some ailment its use should not be disregarded in relieving other symptoms. Typical effects of marijuana only last from minutes to at most 10 hours.

On the other hand, multiple studies suggest that marijuana can result in negative medical implications in mental health. Medical researchers uncover that prolonged use of marijuana is likely to accelerate risks of psychoses and schizophrenia. Moreover, use of marijuana is likely to exacerbate bipolar symptoms especially for patients suffering with the ailment.

In addition, handful of evidence suggests that frequent use of marijuana is likely to develop depressive disorder and suicidal thoughts. Altogether, scholars conclude that the evidence pertaining to the latter is actually limited. Basically, there is not much evidence that either refutes or supports the relationship between use of marijuana and increased bipolar disorder and post-depression. As is the case, smoking tobacco ordinarily increases risks of neck, head and lung cancers. Similarly, some studies suggest that smoking marijuana results in the same effect.

In essence, marijuana contains twice the amount of carcinogens found in tobacco. Moreover, researchers have also uncovered moderate evidence that suggests that prolonged use of marijuana may result in testicular cancer. Researches also could not find any substantial evidence that correlates the use of marijuana in pregnancy to cancer risks in offspring’s.

However, it is important to note, that use of marijuana in pregnant women may impair overall growth of the fetus. While scientific research suggests that the use of marijuana in medicine provides some benefits and risks, the National Academies of Sciences, Engineering, and Medicine postulate that there is need for further research on the same.