Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 49.1, Problem 2R
Summary Introduction
To review:
The survival of small organisms such as sponges without the presence of a circulatory system.
Introduction:
Sponges are the invertebrate and multicellular organisms, which belongs to phylum Porifera. They are the simple marine animals with the presence of an opening called operculum through which the water enters into the body. They lack the presence of any specialized cells, organ or organ system.
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Water moving through a sponge is an active or passive process?
Do sponges have nervous, circulatory and excretory systems?
Which statement about sponges is false?
Their bodies are supported by silicaceous or calcareous spicules.
They feed via flagellated choanocytes.
They have cell layers and true organs.
Some species live in fresh water.
Their bodies have an extracellular matrix composed of collagen and adhesive glycoproteins.
Chapter 49 Solutions
Life: The Science of Biology
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- Why are glass sponges distinguished from sponges with cellular bodies?arrow_forwardWhich class of Cnidarian is described below: This class includes the corals and the sea anemones. Individual animals are cylindrical in shape and are attached directly to a substrate in the polyp body form. Question 18 options: a) Class Hydrozoa b) Class Scyphozoa c) Class Cubozoa d) Class Anthozoaarrow_forwardClass Gastropoda and Class Bivalvia independently evolved modifications to their body plan that allowed them to invade sandy and muddy habitats, burying their bodies under the surface and accessing the surface via siphons. For an example organism in each Class, (1) draw a diagram showing the morphological modifications and (2) write a description of how this organism had evolved from the hypothetical ancestral mollusk (HAM) body plan.arrow_forward
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