ANS 282 Exam 1 - ANS 282 Exam 1 Introduction Lecture...

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ANS 282: Exam 1 Introduction Lecture Paleozoic Era (570 million to 245 million years ago) Mesozoic Era (245 million to 65 million years ago). Each of these eras is divided up into sections called periods. Terrestrial “animals” first appeared on earth during the Ordovician Period. This was around 500 – 440 million years ago. These were invertebrates and consisted mostly of arthropods and worms. Bony fish also appeared during the Ordovician period Land vertebrates appeared during the Devonian period around 408 - 370 million years ago and were the first amphibians. Also see the first insects and spiders. Carboniferous period – First reptiles appear about 360 million years ago Triassic period, 245 - 208 million years ago, first dinosaurs appear – Coelophosis , Euskelosaurus , crocodiles and frogs Jurassic period, 208 – 144 million years ago, first birds (Archaeopteryx) and mammals appear. Dinosaurs included diplodocus, stegasaurus, brachiosaurus. Dinosaurs are abundant. Cretaceous period, 144 – 70 million years ago, dionsaurs and marine reptiles reached their greatest abundance and then just disappeared. Paleocene and Eocene epoch, 70 – 40 million years ago, placental mammals evolved, dispersed and adapted to new environments all over earth. Many of these placental mammals are now the companion and food animals that the human race depends on. Animals in Society: 1. Food– Beef, chicken, pork, lamb, venison, etc. 2. Companions– Pets 3. Service – Leader dogs for blind, deaf, emotionally handicapped 4. Work– Police dogs, military dogs, dog sled, tracking dogs, herding dogs, guard dogs 5. Entertainment – Circus, Zoos, dog racing, horse racing, movies 6. Mascots – Detroit tigers, Georgia Bulldogs, Denver Broncos, etc Binomial system of classification – Kingdom, phylum, class, order, family, genus, species All organisms are divided into one of 5 kingdoms. 1. Monera– Bacteria that lack a true nucleus and reproduce by fission. 2. Protista – single celled animals including Algae. 3. Plantae – multicellular photosynthesizing organisms, higher plants, multicellular algae 4. Fungi – yeasts, molds, fungi 5. Animalia – vertebrate and invertebrate animals. Why classify stuff this way? Allows us to converse on a world wide basis . Help to avoid regional names for things. May have legal implications in some situations. Reptilia
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Poikilothermy - This refers to creatures whose internal temperature varies, often matching the ambient temperature of the immediate environment Entirely Bony skeleton, Usually a heart with two atria and one ventricle. Osteichthyes Live in water Have permanent gills for breathing Have fins Body is usually covered in scales What is a companion animal versus a pet?
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