Parasitism has been feared by most people since ancient times as one of the horror elements of human beings. What is parasitism? If you open the dictionary, you can find a clear definition.

The relationship between two organisms living together, one party benefits and the other suffers, and the latter provides nutrients and a place to live for the former, and this biological relationship is called parasitism.

The main parasites are bacteria, viruses, fungi and protozoa. Among animals, parasitic worms are particularly important, while insects are the main large parasites of plants. Obligate parasitism must be based on the host as a source of nutrition, and facultative parasitism can also operate freely. Parasitoids contain a large group of insect macroparasites that lay eggs on or in the body of the insect host, often resulting in host death.

Unfortunately, for human beings, who are spirits of all things, they usually exist as hosts. Of course, there are also some non-mainstream people with advanced ideas who believe that human beings are actually parasites, parasitic on the surface of the earth, and survive by absorbing the earth's nutrients.

Once the earth's resources are exhausted, who knows if humanity will find another planetary scourge or destroy it?

I don't know, my lack of knowledge is not enough to judge the results. If it's far away, let me, silent at night, tell you a special story about parasitism this time......

introduction

Summer has arrived, and the larks on the outskirts of the garden begin to make unpleasant courtship calls. Although it is only 30 kilometers away from the city, it is far away from the hustle and bustle, and there are not many people coming and going, and even the nearby residents have moved away, leaving only groups of low-rise abandoned buildings and empty old villages.

Humans are so strange as social creatures, and it stands to reason that the village chief in front of him should be extremely well-located, located upwind and water, close to the city. But it was abandoned for no reason. The thriving birch groves swayed their foliage in the wind, dim and silent.

Until a string of footsteps broke the calm of this desolate village.

"Dongming, is there really a stream there? Don't lie to me. A group of people driving the car pulled up at the end of the road, deep in the woods, and walked four girls and a boy. They were wearing the uniforms of the third year of Yuanling No. 1 High School, and one of the girls grabbed the arm of the boy who was driving and asked.

"Of course, my grandfather used to live here and used to come here when he was a kid." The boy named Dongming nodded affirmatively: "Do you remember that more than 100 years ago, there was a lot of schistosomiasis in Yuanling?" The source is said to be this village. ”

"Of course, I remember that I can still find some books in the library about the schistosomiasis epidemic a hundred years ago. I've also looked it up. "The girl at the end of the line was Charlene, and she had eyes and an intellectual glow all over her. Her beautiful long eyelashes fluttered under the lenses, and the eyes in front of her eyes not only could not hide her beauty, but also cast a layer of mystery over her.

"Wow, I didn't expect you to do your homework. Sure enough, he is a gifted student! Zhou Yan clapped her hands and sighed.

"It's my habit, it's been like this since I was a child, and I can't get rid of it." Charlene was praised and looked embarrassed.

"I don't understand, why did you suddenly become beautiful, it's just envious, jealous and hateful." Zhang Min took out a comb and combed his long smooth hair.

"As I said, I bought it online and just gave it a try. Didn't expect it to really work. I asked the seller, and now the wind is tight, and now it is really out of stock. But that's where he caught it! Charlene blinked nervously, and asked pitifully, "You can't be trying to throw me out of the club again, right?" ”

"Ann, Ann, no." Li Qing, who was the first to speak, glared at Zhang Min comfortingly: "You see that you scared Linlin, knowing that she is very timid." ”

Zhang Min laughed awkwardly, but there was a hint of disdain in the corners of his eyes.

Not long after walking forward, I heard the sound of a rushing stream crashing against a rock. Turning out of the woods was a reed, a large reed surging its branches and leaves, trying to stretch towards the sky. The reeds look beautiful, but they also cut off the road to the river.

"No way!" Zhou Yan glared at Dongming: "What about the river you are talking about?" ”

Dongming tentatively stepped on the reedy mud with his foot, and shook his head: "It seems that there is only a detour, and there is no way to go down this place." ”

"Forget it, let's go around, after all, Xiaodong hasn't been back for a long time. The village has been deserted for so long, and it is normal for a few reeds to grow along the river. Zhang Min pursed her lips, and she patted Dongming on the shoulder: "You give me a good memory, if we don't achieve our goal this time, you just wait to be expelled from the school." ”

The muscles on Dongming's face twitched, and he lowered his head and smiled: "Miss Zhang, what you said." The little ones are going to look for them right away, and they're going right away. ”

After speaking, he looked meditative and took everyone around the river. This walk was half an hour, and except for Charlene, the other three girls were all miserable.

"I haven't reached the river yet, I'm tired." Zhou Yan squatted down, took off her shoes without a ladylike image, and rubbed her feet.

"Xiao Lin, I can't see that you are thin and weak, I didn't expect your physique to be so good." Li Qing admired: "Look at you, you haven't sweated a drop." ”

"Actually, I'm tired to death, but I'm not a natural sweater." Charlene touched her forehead, looking very tired, but her expression showed no trace of exhaustion. She looked at the surrounding scenery curiously, and suddenly her ears moved, and she was surprised: "Have you heard any strange sounds?" ”

"Strange voices?" The four of Dongming looked at each other, shook their heads and said, "No." ”

"Absolutely. My ears are very bright. Charlene judged: "The sound was like water boiling, and it was like something constantly fluttering and rolling up and down in the water." It's weird! In that direction. ”

As she spoke, the girl ran with the others toward the east.

It didn't take long to see a gap in the reeds, and the stream was finally exposed to everyone. The five of them approached, and when their eyes touched the water, they were all stunned.

I saw that there were many corpses floating on the water, the corpses of fish. But there was not the slightest rancid smell in the air.

"What's going on? The water upstream is polluted! Zhang Min came back to his senses and trembled.

"Probably not, I haven't heard of any companies upstream. The water in this river is a mountain spring flowing down from the distant mountains, which is delicious and pleasant, and before the village was abandoned, the water of the whole village came from this stream. Dongming shook his head, he picked up a branch from the ground, found a place to step on, and used the branch to move hard at the nearest fish.

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