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 30, Problem 2Q
Summary Introduction
To review:
The reproductive and locomotive difference between the polyp and the medusa forms of the cnidarians and trade off with the reverse development.
Introduction:
Cnidarians are invertebrate, radially symmetrical, and marine animals that belong to phylum Cnidaria. These animals do not have a complete gut instead have a blind sac, which is connected to the single opening called the mouth. They possess Cnidoblasts (stinging cells) on their tentacles, and are thus called as cnidarians.
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Mammals belong to a group of amniotes known as synapsids. Three major lineages of mammals had emerged by the early Cretaceous period. In a tabulated form, compare these three lineages to illustrate their diversity in terms of:a. Embryonic developmentb. How the young are fedc. Period of gestation
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Life: The Science of Biology
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