vb.net qr code generator The Chordata in .NET

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CHAPTER 12 The Chordata
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legs, a bill or a beak, and lays eggs Becoming homeothermic, and thus able to regulate the internal body temperature, really was a big deal for evolution! Prior to the appearance of the birds, all of the other vertebrates (such as sh, amphibians, and reptiles), were classi ed as heterothermic (HET-ur-uhtherm-ik) or poikilothermic (poy-kih-low-THER-mik) This literally means that they had a changeable (poikilo) or di ering (hetero) body heat (therm) That is, before the birds, the existing vertebrates had their body temperatures closely tied to the changes occurring in their surrounding external environment Since they could not self-regulate their own body temperature, they had to resort to various behaviors (such as seen in a turtle or lizard sunning and warming itself on a rock) Because of this body temperature limitation, reptiles and amphibians, for instance, are only able to live in fairly warm habitats After all, you don t see many snakes or frogs near the Arctic Circle! With the appearance of birds, however, all that soon changed! Birds now dwell in nearly every corner of the world, all the while successfully being homeothermic and regulating their own body temperatures Probably one of the rst vertebrates to make this dramatic transition from heterothermic (poikilothermic) reptile to homeothermic bird was a strange creature called Archaeopteryx (ar-kee-AHP-ter-iks) Its odd name, Archaeopteryx, means ancient (archeo) bird or wing (pteryx) A look at Figure 127 clearly shows the reasons Archaeopteryx had such reptile-like
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Sharp beak with teeth Clawed forelimbs
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Stiff tail containing vertebrae
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Fig 127 Archaeopteryx: The ancient bird-reptile
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PART 3 Five Kingdoms of Life, plus Viruses
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characteristics as sharp teeth in its mouth, forelimbs with claws, and a long tail containing vertebrae Yet, it still was part bird, because it sported a beak, and showed two wings with feathers Archaeopteryx lived approximately 150 million years ago, and probably ew over the heads of some dinosaurs!
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CLASS MAMMALIA: BACKBONED ANIMALS WITH BREASTS
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True to their name, mammals are vertebrates that have mammary (MAM-ahree) glands within their breasts (mamm) We, as human beings, of course, share such mammalian (mah-MAY-lee-un) characteristics as the nursing of the young with milk secreted by the mammary glands of the mother s breasts Mammals also have bodies that are covered with hair, rather than with feathers (although hair, like feathers, is rich in the waterproof keratin proteins) Mammals are like birds in that they are endothermic (as was noted back in 3) This means that their body heat (therm) is regulated from within (endo-) (Thus, endothermic is a close synonym or relative of the word homeothermic) Another similarity between birds and mammals is their ancestry It is quite likely that both classes of higher vertebrates evolved from the same lower class the reptiles While Archaeopteryx and other early birds ew over the heads of the dinosaurs, the rst mammals were probably small and rodent-like They probably hid in the forest and ate insects, or scurried to hide in holes below the huge, lumbering feet of the dinosaurs!
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The three major groups of mammals
After an ancient comet or asteroid struck the Earth and created a massive cloud of dust and debris, the lack of sunlight and progressive cooling and drying of the climate probably contributed to the extinction of the dinosaurs With these Terrible Lizards or Kings of the Reptiles gone from the scene, the small, rodent-like mammals had a giant niche (nich) or empty nest of environmental roles and functions ready to be lled During the Cenozoic Era or Age of Mammals ( 3), stretching from about 65 million years ago up to the present, three major groups of mammals have extensively evolved These are called the monotremes (MAHN-uh-treems), marsupials (mar-SOO-pee-als), and the placentals (plah-SEN-tals) (see Figure 128)
CHAPTER 12 The Chordata
Placenta MONOTREMES Platypus PLACENTALS Umbilical cord
Core Insectivores
Moles
Edentata
Proboscidea
MARSUPIALS Kangaroo
Chiroptera
Bats
Anteaters
Elephants
Perissodactyla Cetacea
Whales Horse: uneven toes
Rodentia
Sirenia
Sea cows (manatees)
Beavers
Lagomorpha
Rabbits
Primates
Carnivora
Dogs
Artiodactyla
Camel: even toes
Humans, monkeys
Fig 128 The great story of the mammals
The monotremes are literally mammals with a single (mono-) hole (trem)! This odd name re ects the fact that monotremes have just a single, common opening for both their urinary and reproductive tracts So, besides excreting urine, the monotremes also lay their eggs through this single outlet As the only group of egg-layers, the monotremes are considered the most primitive type of mammals (closest to the reptiles) Today, they are mainly represented by the platypus (PLAT-uh-pus) and the spiny anteaters The platypus is named for its atfootedness, but an even more obvious characteristic is its prominent duckbill The duckbilled platypus lives in Australia and New Guinea, mainly feeding upon insects Marsupials are mammals with little pouches (marsupi) In the wilds of North America, the most familiar marsupial is probably the opossum But as captives in zoos, we usually associate pouches with the kangaroo The koala bear of Australia is another famous marsupial Rather than hatching from eggs (like the monotremes), the young marsupials are viviparous (vy-VIP-ur-
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