搜尋結果
4 天前 · May 9, 2024, 10:08 PM ET (AP) Hungary and China sign strategic cooperation agreement during visit by Chinese President Xi. Belt and Road Initiative (BRI), Chinese -led massive infrastructure investment project aimed at improving connectivity, trade, and communication across Eurasia, Latin America, and Africa.
4 天前 · mutation, an alteration in the genetic material (the genome) of a cell of a living organism or of a virus that is more or less permanent and that can be transmitted to the cell’s or the virus’s descendants. (The genomes of organisms are all composed of DNA, whereas viral genomes can be of DNA or RNA; see heredity: The physical basis of ...
- An individual offspring inherits mutations only when mutations are present in parental egg or sperm cells (germinal mutations). All of the offsprin...
- Mutations in DNA occur for different reasons. For example, environmental factors, such as exposure to ultraviolet radiation or certain chemicals, c...
- Mutation hotspots (or mutational hotspots) are segments of DNA that are especially prone to genetic alteration. The increased susceptibility of the...
3 天前 · Slovakia, landlocked country of central Europe. It is roughly coextensive with the historic region of Slovakia, the easternmost of the two territories that from 1918 to 1992 constituted Czechoslovakia. Slovakia. The short history of independent Slovakia is one of a desire to move from mere autonomy within the Czechoslovak federation to ...
3 天前 · ichthyosaur, any member of an extinct group of aquatic reptiles, most of which were very similar to porpoises in appearance and habits. These distant relatives of lizards and snakes (lepidosaurs) were the most highly specialized aquatic reptiles, but ichthyosaurs were not dinosaurs. Probable birth of an Ichthyosaurus, Early Jurassic fossil from ...
1 天前 · Thailand, country located in the center of mainland Southeast Asia. It is wholly within the tropics and encompasses diverse ecosystems. The capital of Thailand is Bangkok, and the city’s metropolitan area is the preeminent urban center in the country. Learn more about Thailand, including its history.
5 天前 · 1995. Rwanda. 2009. Gabon. 2022. Togo. 2022. The Commonwealth is a a free association of sovereign states comprising the United Kingdom and a number of its former dependencies who have chosen to maintain ties of friendship and practical cooperation and who acknowledge the British monarch as a symbolic head of their association.
2 天前 · Male orangutan (Pongo pygmaeus) with cheek pads. Orangutans are not as powerfully built as the gorilla but are larger than the chimpanzee. The adult male is typically twice the size of the female and may attain a height of 1.3 metres (4.3 feet) and a weight of 130 kg (285 pounds) in the wild; females weigh 37 kg (82 pounds) or less.
