Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 27, Problem 16RQ
Until recent discoveries suggested otherwise, animals existing before the Cambrian period were believed to be:
- small and ocean-dwelling
- small and nonmotile
- small and soft-bodied
- small and radially symmetrical or asymmetrical
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Chapter 27 Solutions
Biology 2e
Ch. 27 - Figure 27.5 If a Hox 13 gene in a mouse was...Ch. 27 - Figure 27.6 Which of the following statements is...Ch. 27 - Figure 27.9 Which of the following statements...Ch. 27 - Which of the following is not a feature common to...Ch. 27 - During embryonic development, unique cell layers...Ch. 27 - Which of the following phenotypes would most...Ch. 27 - Which of the following organisms is most likely to...Ch. 27 - Which of the following is not possible? radially...Ch. 27 - An animal whose development is marked by radial...Ch. 27 - Consulting the modern phylogenetic tree of...
Ch. 27 - Which of the following is thought to be the most...Ch. 27 - As with the emergence of the Acoelomorpha phylum,...Ch. 27 - Which of the following periods is the earliest...Ch. 27 - What type of data is primarily used to determine...Ch. 27 - The time between 542-488 million years ago marks...Ch. 27 - Until recent discoveries suggested otherwise,...Ch. 27 - Plant life first appeared on land during which of...Ch. 27 - Approximately how many mass extinction events...Ch. 27 - Why might the evolution of specialized tissues be...Ch. 27 - Describe and give examples of how humans display...Ch. 27 - How have Hox genes contributed to the diversity of...Ch. 27 - Using the following terms, explain what...Ch. 27 - Explain some of the advantages brought about...Ch. 27 - Describe at least two major changes to the animal...Ch. 27 - How is it that morphological data alone might lead...Ch. 27 - Briefly describe at least two theories that...Ch. 27 - How is it that most if not all, of the extant...
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- Animal Kingdom Do not possess a backbone Possess a backbone Asymmetric, Bilateral symmetry, does not Four limbs; possesses true tissues, three germ layer, most have a complete gut possess true possesses a notochord lungs tissues Mouth forms second, Radial symmetry, opposite end from the blastopore possesses true tissues, two germ layers, gastrovascular cavity, cnidocyte stinging cells Terrestrial adaptation to protect embryo possesses a spiny skin or calcareous endoskeleton, water vascular system Mouth forms first from the blastopore Place the letter in the Arthropoda i. j. h. Sheds a cuticle or possesses either a lophophore feeding apparatus or a trochophore larvae appropriate blank tetrapods Porifera exoskeleton via ecdysis a. Echinodermata b. Cnidarians k. Vertebrates Ecdysozoa I. Protostomia с. d. Deuterostomia m. Amniotic egg Bilateria Segmented, possess jointed feet, complex head (cephalization) Lophotrochozoa Chordata е. n. Segmented, bristles, f. Annelida o. g. invertebrates…arrow_forwardANCESTRAL PROTIST Metazoa Eumetazoa 770 million years ago 680 million years ago Bilateria 670 million years ago Porifera Ctenophora Cnidaria Acoela Deuterostomia Lophotrochozoa Hemichordata Echinodermata Chordata wwwwww Platyhelminthes Syndermata Ectoprocta Brachiopoda Ecdysozoa Mollusca Annelida Nematoda Arthropoda Which of the following statements is true based on the phylogenetic tree shown?arrow_forwardA bird, from a modern phylogenetic systematic perspective, is properly classified as a member of all of the following except Group of answer choices Archosaur Gnathostome Amniote Synapsidarrow_forward
- What are examples of the following groups of vertebrates: Chondrichthyes, Actinopterygii, Actinistia, Dipnoi, and Tetrapoda? How many species are in each of the above groups? Which one has the most species? When did the first vertebrates appear, and when did they first live on land? Where do we find the earliest fossils of vertebrates, and where do we find the earliest fossils of terrestrial (land-living) vertebrates? What are the following and how are they related to humans: Pongo, Gorilla, Pan, Sahelanthropus, Ardipithecus, Australopithecus, Homo erectus, and Homo neanderthalensis? Which of these is our closest living relative? What are some of the traits that these organisms share with us? When and where did each of the extinct forms above live? What does this tell us about when our lineage split from the most recent ancestor we share with our closest living relative?arrow_forwardIn the phylogeny below, the origin of which trait could be indicated by the letter B? A single temporal opening on the side of the skull Extra-embryonic membranes A placenta Jaws Hair and mammary glands lungfish frogs salamanders caecilians parareptiles turtles lizards mosasaurs snakes ichthyosaurs plesiosaurs crocodiles ornithisichian dinosaurs non-avian saurischian dinosaurs birds eothyridids caseids varanopids ophiacodontids edaphosaurids sphenacodontids biarmosuchians dinocephalians squopowoue gorgonopsians therocephalians snupeubossejeyɔ Probainognathus uopouoɔous marsupial: monotremes placentalsarrow_forwardSponges (Phylum Porifera) are the basal taxon to animals and were once thought to belong to plants. 1) Identify three characteristics that distinguish sponges from plants. 2) Identify three characteristics (present or absent) that distinguish sponges from other animal taxa.arrow_forward
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