Sunday, 24 September 2017

A great piece of explanation writing from Pawan Reddy about what a parasite is

                                        Parasites

A parasite is a microorganism that lives in another organism, called the host, and often harms it. It is dependent on its host for survival - it has to be in the host to live, grow and multiply. It will also slowly kill the host. A parasite cannot live independently.

Humans are hosts to nearly 300 species of parasitic worms and over 70 species of protozoa, some derived from our primate ancestors and some acquired from the animals we have domesticated or come in contact with during our relatively short history on Earth. Our knowledge of parasitic infections extends into antiquity, and descriptions of parasites and parasitic infections are found in the earliest writings and have been confirmed by the finding of parasites in archaeological material. The systematic study of parasites began with the rejection of the theory of spontaneous generation and the promulgation of the germ theory. Thereafter, the history of human parasitology proceeded along two lines, the discovery of a parasite and its subsequent association with disease and the recognition of a disease and the subsequent discovery that it was caused by a parasite.

There are two classes of parasites, The social parasite and the biological parasite. The social parasite is a parasite that finds a way into its host be it eaten with it's food or something more horrendous. Once inside the body it slowly grows, feeding on the organs of the host until it has fully grown. Once It has reached this stage, it will eat it's way through the host - this is a slow but painful process. The other type of parasite is called a biological parasite. This parasite starts off as a micro cell that finds a plant that suits it and attaches itself to the outside of the plant, It doesn't just pick any random spot it choses the place that gets the most nutrients. Over time when the plant grows the parasite will start will grow with it extracting the nutrients it needs to grow, which mostly makes the plant grow slower because it doesn't have the nutrients it needs to grow. Some parasites can cause mass destruction. Like one time in south America a farmer was cutting down some crops when he saw something growing on them, he thought it would be fine if he scraped it off so he did. But that end so well because, when he was feeding the crops to his pigs they all died. An autopsy done on them found that they had been poisoned by a Parasitic plant called Hydroid. It turns out when he scraped it off the crops they released a poison.

affect you

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