Asking for an introduction to the marine ecosphere, urgently needed, homework assigned by the teache

The ocean covers 70% of the Earth's surface area, and the ocean is the most comprehensive productive ecosystem on the planet. For marine ecosystems, biomes such as interconnected animals, plants, microorganisms, etc. are the biological components, while non-biotic components are the marine environment: sunlight, air, seawater, inorganic salts, etc.

Like terrestrial ecosystems, the circulation of matter and the flow of energy are essential functions of marine ecosystems. One of the most common examples in the ocean is: big fish eat small fish, small fish eat shrimp, shrimp swallow sea squirrel, eat seaweed, seaweed absorbs sunlight and inorganic salts from the sea or seabed for photosynthesis, produces organic matter, and maintains this food chain.

The marine ecosystem consists of four components: the inanimate marine environment (matter and energy), which is produced by plants such as seaweed; Consumers: Whether it is a large fish, a small fish, a shrimp or a sea squirrel, they cannot make organic matter on their own, but can only live by predation; And then there are the decomposers, mainly microorganisms, they are the hard-working "scavengers", without them, the ocean may not be long to be filled with the excretions or remains of animals and plants, in this material cycle chain, without any link, the machine will not operate, they are interdependent, mutually restrictive, mutually reinforcing.

The material cycle and energy flow of marine ecosystems follow the law of the "ecological pyramid". Taki is the producer - seaweed, it absorbs solar radiation energy from seawater, and converts it into the energy base of this ecosystem, it can be said that marine phytoplankton is the basis of the entire marine ecosystem, and the power that ultimately drives the operation of the "living machine" of the entire biosphere ecosystem comes from solar radiation energy. The material cycle and energy flow of marine ecosystems are dynamic processes, and a state of dynamic equilibrium will be reached without external interference.

Therefore, the overexploitation and fishing of marine organisms will lead to the reduction of biomass in one link, which will inevitably lead to the reduction of the number of organisms in the next link. In recent years, due to the excessive fishing of aquatic products such as fish and shrimp, the destructive power exceeds the fecundity of organisms, making it difficult for fish and shrimp to survive and reproduce in large quantities. Marine pollution is one of the main culprits of the imbalance of marine ecosystems.

When marine pollution occurs, marine flora and fauna are the first to be harmed, and it is human beings who ultimately suffer from the damage.

Marine biosphere. The different global oceans are a unified biological chain. Ten kilometers is only an approximate range, because the vast majority of plants need light, and the vast majority of animals need to obtain energy directly or indirectly from plants for their survival, so there is very little life in the deep sea where sunlight does not shine.

But nature is magical, and there are some amazing bacteria that can survive down there. Ecosystem.

It is believed that the biota that survive in the trench is an ecosystem that relies mainly on photosynthesis, but due to the lack of food in the deep sea, eukaryotes living in this extreme environment may coexist with bacteria to obtain nutrients. In the future, genetic analysis and histological studies using electron microscopy will be able to understand the environmental adaptation mechanism of organisms in the extreme environment of the deep sea and the physiological structure of symbiosis with bacteria, which will have a positive significance for the discovery of functional genes that can be used. Due to the existence of trenches of various shapes on the deep seabed, recent studies have predicted the distribution of different species of biological communities in different ocean trenches, which can understand the emergence of ocean trenches and the evolution of trench biological communities, and can fill a gap in the history of life development.

It's good to read.

Books are the fervent hope of mankind; Books contain a wealth of human feelings, and when it comes to books, there will be endless words ......

I love to read and swim in the ocean of knowledge. In the sea of books, I can "raise a glass to invite the bright moon" with Li Bai and appreciate the peerless talent of "poet immortals"; climbed Yueyang Tower with Fan Zhongyan to experience his feelings of "worrying about the world first, and enjoying the joy of the world after the world"; Share with Du Fu the indescribable ......mood of "comic poetry and book ecstasy".

In the sea of books, I seem to have witnessed the scene of the Warring States Period, the scene of the heroes fighting for hegemony, the innocent people shedding blood on the battlefield, the girls to be married without relatives, and the heroic soldiers fighting bloody ......This scene was beating in front of my eyes.

In the sea of books, I seem to hear the Yellow River roaring sadly, and she is calling on us Chinese sons and daughters not to forget the humiliating years of the past - not to forget how the British invaders "knocked" on the door of China with cannons and opium; Don't forget that in the face of the bayonets of the Japanese devils, the people blew up the embankment of the Yellow River and exchanged the disasters of millions of working people for a temporary relaxation in the war situation; Do not forget how the Chinese people were bullied and oppressed by the great powers and suffered in dire straits. This injustice, this grievance, hard work!

We are reading now, not for the sake of "having Yan Ruyu in the book and ** house in the book."", not to "glorify the ancestors", let alone to "knock" on the door of the government, we are just to resound the sentence: "For the rise of the Chinese nation!" ”

Unforgettable reading season! It's always like a flower-like season, a dream-like artistic conception. Let's put on our schoolbags together, step on the bright spring light, walk to the resort in our hearts - the school, and shout to the sky: "It's good to read!"

The famous Gorky once said: "Books are the ladder of human progress." "Books can also give you many important benefits.

Reading more books can make you feel that you have a lot of inspiration for writing, and you can use the method of writing essays better. When writing, we can often use some good words and sentences and life philosophies in the book. Let others think that you are more literary and beautiful.

Reading more books can make your whole body polite. As the saying goes, "First impressions matter." "From the first impression you make on someone, you can let others see what kind of person you are. Therefore, reading more books can make people feel that you are knowledgeable and reasonable.

Reading more books can allow you to increase a lot of extracurricular knowledge. Mr. Bacon once said, "Knowledge is power."

Yes, reading more books and increasing extracurricular knowledge can fill you with strength. This power can motivate you to keep discovering the "fruit." "Keep growing, keep moving forward.

From the book, you can often find the shortcomings, so that you can constantly correct your mistakes and correct your own direction. Therefore, books are also our mentors and friends.

Reading more books can make you smarter and wiser to defeat your opponents, and books make you smarter, so that you can face difficulties bravely. So that you can solve this problem in your own way. In this way, you have taken the first step on your own path in life.

Reading more books can make you smarter and make your mood happy. Reading is also a form of leisure, a form of entertainment. Reading books regulates blood flow in your blood vessels, making you physically and mentally healthy.

Therefore, swimming in the sea of books is also an infinitely happy mood. It's also wise to use reading a book to make a relaxing time for yourself.

I love to read "idle books" and am famous at home. Therefore, my mother set a "house rule" for me to read for no more than half an hour a day, which made me very angry, so I seized all the time to read: "Go to the toilet and read, eat and .......""As a result, I still have as much time as I used to.

Once the book was in my hands, I still had to exceed the time set by my mother, and my mother had no choice but to shake her head and walk away.

I like to read, I don't know if I like it because it's interesting, or if it's because I like it. Reading can cultivate people's sentiments and give them knowledge and wisdom. Therefore, we should read more books to lay a good and solid foundation for our future life path!!

Books, like a pair of clairvoyance, let us understand the world; Books, like a knowledgeable and kind old man, impart profound knowledge to us. "Books are the ladder of human civilization progress", since I became literate, books have become my friends day and night. In my bookcase, there are hundreds of children's books, large and small, and whenever I have time, I will sit down and read them with a lot of taste.

I heard my mother say that when I was still in the cradle, as long as I cried, my father would take the "Enlightenment" magazine and read me stories in his non-standard Mandarin.

As I grew older, my love of reading became so obsessive that I became a "little bookworm". The reason why I love reading so much is because reading not only allows me to absorb a lot of knowledge nutrition, but also gives me a lot of happiness.

I remember when I was in the second grade, in a nature class, the teacher suddenly mentioned a problem outside the textbook, and the classmates didn't know, but I had just seen it in the "Children's Encyclopedia", so I proudly raised my little hand and answered the teacher's question, and the classmates were impressed with me, and from then on, the students all knew my biggest characteristic - love to read, and gave me the nickname of "little bookworm". One day last year, the teacher assigned math homework, the teacher first wrote a few simple questions, and then the teacher wrote a few difficult questions, the students were dumbfounded, the teacher said: "Don't worry, go back and flip through the book, the teacher believes you can solve it."

When I got home, I couldn't do these questions. I went to the "Little Math Troubleshooting" that my mother bought for me, and finally turned to a question type similar to these questions. So I followed the solution in the book and combined with the content of the day's study, and got a few questions right, not to mention how happy I was, and I once again experienced the joy of reading.

Now, I am in the sixth grade, and every time I give an essay review, the teacher praises my essay in the class for being good, because I use many good words and sentences, and these good words and sentences are accumulated by my usual reading. It's good to read. Reading has broadened my horizons; Reading enriches my mind; Reading makes me feel confident; Reading makes my life so enjoyable.

Today is Friday, and tomorrow will start a "long" 2-day holiday, but homework is always indispensable, usually 2 essays plus some copying homework, and by the end of school, we are mentally prepared to bear a lot of homework. At this time, I saw Mr. Zhong and Mr. Liao walking into the classroom with smiles on their faces, and our mood was not so relaxed, because we couldn't do it and we had to soak in the "ocean" of homework all SundayAt the end of school, I saw Mr. Zhong writing his homework on the blackboard, and all of a sudden, the eyes of the whole class were focused on the blackboard.

At this time, I saw the teacher wave his pen and write on the blackboard the eight big words "no homework today", and suddenly, the whole class was cold. After a short n minutes, the students finally broke out and cheered loudly, and some said to their tablemates: "It's really not easy for our teacher Zhong today, she didn't assign homework (she put the two words very loudly), it seems that the sun should come out of the west tomorrow."

I am very puzzled, what is going on today, Mr. Zhong, who has been shouting that he wants to assign more homework, actually does not assign homework, there must be some article in this! As I expected, I saw Mr. Zhong write the word "composition" on these eight words, and put a colon and the title of the book. Suddenly, the class was in an uproar.

Oops, the "sound" kept coming from the students' seats. But then Mr. Zhong said softly: "This week's essay."

When I heard this, I went crazy with joy, and suddenly the whole class heard the sound of "Ula". Huang Rui jumped up with joy. The teacher couldn't help but laugh when he saw this.

Lala-la-la......"On the way, the schoolbag seems to be much lighter, jumping on my back, my mood is so relaxed, and my steps are so brisk. Yes! It was a carefree night!

It's great that there was no homework today!

1. A friend's doorstep is a lawn on the school's lawn.

First, the research topic.

Applications of nanotechnology in biomedicine.

Oops, I learned it before, but I can't seem to remember it now, and I lost my points like this, it's a pity.

Introducing some of the creatures of the seabed, fish, sea plants, etc.

There is a **, text description.

Suggested content arrangement.

1: ** of an earth, several oceans above, the text explains how many oceans there are on the earth, how much of the earth's area;

2. Classification of the seabed: animals,,, plants, (coral reefs, etc.) 3. Introduction to the big shark -- characteristics.

4. Haiteng - why is it smart,。。 Interspersed with questions ,,, way, with animation effects,) coral reefs. Introduce.

The ocean is a marine animal, a friend of human beings,,, introduced.

Finally, we need to work in harmony with the development and utilization of the ,,, ocean