Systemic arteries are the arteries (including the peripheral arteries), of the systemic circulation, which is the part of the cardiovascular system that carries oxygenated blood away from the heart, to the body, and returns deoxygenated blood back to the heart.
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Explanation:
Alexander the Great was a king of Macedonia who conquered an empire that stretched from the Balkans to modern-day Pakistan. Alexander was the son of Philip II and Olympias (one of Philip's seven or eight wives). He was brought up with the belief that he was of divine birth. He became king upon his father's death in 336 BCE and went on to conquer most of the known world of his day. He is known as 'the great' both for his military genius and his diplomatic skills in handling the various populaces of the regions he conquered.
Extinction may occur naturally as a result of a calamity, ongoing environmental stress, or ecological interactions like competition, sickness, or predation.
This occurs when a species' population gradually but steadily decreases at the conclusion of its time of development on Earth. Many North American mammals went extinct during the end of the last ice age, 10,000 years ago, including mammoths, mastodons, and glyptodonts. In addition to climatic change, overhunting by humans was another contributing cause, according to paleontologists' evidence. The phrase "extinction" refers to the end of a particular type of organism or a set of types, typically a species. Although the ability to reproduce and bounce back may have been lost earlier, the death of the last member of the species is typically considered to be the moment of extinction. Determining this point is challenging because a species' potential range may be quite wide, and is typically done after the fact. Due to this problem, there are phenomena like Lazarus taxa, in which a species that was thought to be extinct suddenly "reappears" after a period of apparent absence (usually in the fossil record).Estimates place the number of extinct species at over five billion, or more than 99% of all species that have ever existed on Earth. There are now about 8.7 million species of eukaryotes in the world, and if bacteria and other microbes are included, there may be many times more. Non-avian dinosaurs, saber-toothed cats, dodos, mammoths, ground sloths, thylacines, trilobites, and golden toads are a few notable extinct animal species.
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