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Giải SBT Hóa 11 Bài 7 (Kết nối tri thức): Sulfur và sulfur dioxide
Tháng Mười 9, 2023
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Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question. Scientists have identified two ways in which species disappear. The first is through ordinary or “background” extinctions, where species that fail to adapt are slowly replaced by more adaptable life forms. The second is when large numbers of species go to the wall in relatively short periods of biological time. There have been five such extinctions, each provoked by cataclysmic evolutionary events caused by some geological eruption, climate shift, or space junk slamming into the Earth. Scientists now believe that another mass extinction of species is currently under way – and this time human fingerprints are on the trigger. How are we doing it? Simply by demanding more and more space for ourselves. In our assault on the ecosystems around us we have used a number of tools, from spear and gun to bulldozer and chainsaw. Certain especially rich ecosystems have proved the most vulnerable. In Hawaii more than half of the native birds are now gone – some 50 species. Such carnage has taken place all across the island communities of the Pacific and Indian oceans. While many species were hunted to extinction, others simply succumbed to the “introduced predators’ that humans brought with them: the cat, the dog, the pig, and the rat. Today the tempo of extinction is picking up speed. Hunting is no longer the major culprit, although rare birds and animals continue to be butchered for their skin, feathers, tusks, and internal organs, or taken as savage pets. Today the main threat comes from the destruction of the habitat of wild plants, animals, and insects need to survive. The draining and damming of wetland and river courses threatens the aquatic food chain and our own seafood industry. Overfishing and the destruction of fragile coral reefs destroy ocean biodiversity. Deforestation is taking a staggering toll, particularly in the tropics where the most global biodiversity is at risk. The shinking rainforest cover of the Congo and Amazon river basins and such places as Borneo and Madagascar have a wealth of species per hectare existing nowhere else. As those precious hectares are drowned or turned into arid pasture and cropland, such species disappear forever. Source: Final Countdown Practice Tests by DF Piniaris, Heinle Cengage Learning, 2010 What does the passage mainly discuss?
Tháng Mười 2, 2023
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Giải SGK Toán 11 Bài 30 (Kết nối tri thức): Công thức nhân xác suất cho hai biến cố độc lập
Tháng Một 2, 2024
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Soạn bài Thực hành tiếng Việt lớp 8 trang 115 tập 1 | Chân trời sáng tạo Ngữ văn lớp 8
Tháng Chín 28, 2023
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Hai đường thẳng (a) 4x+ 3y- 18= 0 và (b) : 3x+ 5y-19= 0 cắt nhau tại điểm có toạ độ:
Tháng Tám 24, 2023
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________ a scholarship, I entered one of the most privileged universities of the United Kingdom.
Tháng Mười 23, 2023
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According to the passage, which of the following is UNTRUE about optimism?
Tháng Chín 12, 2023
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.Living things include both the visible world of animals, plants, and fungi as well as the invisible world of bacteria and viruses. On a basic level, we can say that life is ordered. Organizations have an enormously complex organization. We’re all familiar with the intricate systems of the basic unit of life, the cell. Life can also “work.” Living creatures can take in energy from the environment. This energy, in the form of food, is transformed to maintain metabolic processes and for survival. Life grows and develops. This means more than just replicating or getting larger in size. Living organisms also have the ability to rebuild and repair themselves when injured. Life can reproduce. Think about the last time you accidentally stubbed your toe. Almost instantly, you moved back in pain. Finally, life can adapt and respond to the demands placed on it by the environment. There are three basic types of adaptations that can occur in higher organisms. Reversible changes occur as a response to changes in the environment. Let’s say you live near sea level and you travel to an approximate area. You may begin to experience difficulty breathing and an increase in heart rate as a result of the change in altitude. These symptoms go away when you go back down to sea level. Body-related changes occur as a result of prolonged changes in the environment. Using there previous example if you were to stay in the heart normally, you would notice that your heart normally and would begin to slow down normally and would begin to breath normally. These changes are also reversible. Genotypic changes (caused by genetic mutation) take place within the genetic makeup of the organism and are not reversible. An example would be the development of resistance to pesticides by insects and spiders. Which type of living creatures can adapt to the changes in the environment?
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