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"The moon waxes and wanes," the sea has its ebb and flow, and the water in the sea rises and falls on time every day. In ancient times, people called the rise and fall during the day "tide" and the rise and fall at night as "tide". Together they are called "tide". Tidal phenomena cause the se
The continental shelf is a natural extension of the continent. The slope is generally small and there are not many fluctuations. The total area of the world's continental shelves is approximately more than 27 million square kilometers, with an average width of approximately 75 kilometers, acc
The seafloor is part of the earth's surface. The seabed is not as flat as we imagine. If the sea really turns into a mulberry field, we will find that the appearance of the underwater world is very similar to the land we live on: majestic mountains, deep trenches and canyons, and vast plains
In the South Pacific, between Australia, Papua New Guinea, the Solomon Islands, the New Hebrides Islands, New Caledonia and the 30th parallel south, there is a colorful sea called the Coral Sea. The Coral Sea is connected to the Solomon Sea to the north and the Tasman Sea to the south. It cov
Going south from the East China Sea through the narrow Taiwan Strait, we enter the turbulent South China Sea. The South China Sea is the deepest and largest sea in my country and the third continental sea in the world after the Coral Sea and the Arabian Sea. The South China Sea is located at
The Atlantic Ocean is between Europe, Africa, America and Antarctica. It is the second largest ocean in the world and the youngest ocean, only 100 million years ago. The Atlantic Ocean has an area of 93.363 million square kilometers, an average depth of 3627 meters, and a maximum depth of 921
Imagine that you are a researcher who conducts an ingenious experiment and uses all your scientific experience to successfully complete the experiment. Many years later your phone rings with congratulations from colleagues because you have just won the Nobel Prize. You fly to Stockholm, Swede
A foal in Devon, England, was born on a mountainside in a national park. Shortly after its birth, it was abandoned by its mother. Since then, with the help of the staff, the foal has recovered to health and has adopted a toy teddy bear as its "mother" and has been inseparable from it.
Different eras require animals to have different survival abilities. If you lived in ancient times, huge size and ferocious habits once became the most important characteristics of animals. Currently, 593 species of birds, more than 400 species of animals, 209 species of amphibians and reptil
Our current human beings are members of the genus Homo. They evolved from Homo habilis through Homo erectus and early Homo sapiens. Why did only early members of the genus Homo develop into modern humans while the various Australopithecus species living at that time failed to continue develop
Among the relics of the Peking people discovered in Zhoukoudian, there are not only a large number of stone tools, but also many tools made of animal bones or horns - bone tools. A more important discovery is the evidence that people in Beijing used fire. Among the eviden
While Dart and Bloom continued to discover Australopithecus in South Africa, the famous British paleoanthropologists Leakey and his wife (Louis Leakey and Mary Leakey) were also working hard in East Africa. On July 17, 1959, after nearly 30 years of unremitting search, they finally got their
In Africa more than 100,000 years ago, the earliest humans appeared who were identical in body anatomy to modern humans. They were called late Homo sapiens, modern Homo sapiens, or simply modern humans by paleoanthropologists. . The morphological differences between late Homo sapiens and earl
The status of human beings in the biological classification system is: Kingdom Animalia, Phylum Chordata, Subphylum Vertebrates, Class Mammalia, Order Primates, Suborder Anthropoid, Suborder Stenorrhinus, Superfamily Hominidae, Hominidae, Genus Homo, Homo sapiens kind. pr
The earliest true beasts were insectivores (order) that appeared in the Cretaceous. After entering the Cenozoic Era, the eutherians differentiated from this basis and evolved at a very fast speed, resulting in a wide range of adaptive radiation. The first change in the history of Cenozoic mam
A large number of primitive mammal fossil skeletons discovered in the Triassic strata of South Wales, England, are representatives of the earliest mammals on the earth. Paleontologists named them Morganotherium and placed them in the subclass Eotherium and the order Stylodontia.
Frogs, toads and salamanders are familiar amphibians. They are still active in ponds, rice fields, swamps, streams, rivers and wet places on land. All these living amphibians belong to a large family, the "slip-bodied amphibians", which used to be called "armorless amphibians". As the name su
At the end of the Devonian period, a certain kind of lobe-finned fish ventured out of the water and climbed onto land, becoming the earliest amphibians. Since then, vertebrates have entered a new world completely different from the environment they had lived in for hundreds of millions of yea