Answered: anism shown above have that indicate…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Hello, I need help with number 3 a, b, & c using the diagram below. Pls & thank you! 3. a) What features does the organism shown above have that indicate that it is our direct ancestor among the Cambrian fauna? 3. b) When the organism shown above was swimming in the Cambrian seas, it was very small compared to the apex predator (Anomalocaris), which was several feet long. What adaptations might the organism shown above have to evade predation by Anomalocaris? 3. c) A famous evolutionary biologist says that “everything in evolution is contingent”, which he explains means that events could always have turned out differently. Do you think that the survival of our direct ancestor is an example of a lucky accident that allowed the later evolution of vertebrates, including us? Why or why not? Photos reference: Futuyma, D. J., & Kirkpatrick, M. (2017). Chapter 17 The History of Life. In Evolution (4th ed., pp. 430-467). Sunderland, Massachusetts: Sinauer Associates.

FIGURE 17.11 Cambrian vertebrates. (A) Photo and drawing of one of the earliest
known vertebrates, Haikouichthys, of the early Cambrian. The drawing calls attention
to features that are characteristic of vertebrates. (B) Bony, toothlike structures of Cam-
brian conodonts. Conodonts were slender, finless chordates believed to be related to
agnathans (jawless vertebrates such as lampreys). (C) Reconstruction of a jawless, limb-
less ostracoderm, Arandaspis, as it may have appeared in life. Note the heavy armor
on the front part of the body. Ostracoderm armor has been found in late Cambrian
rocks. (A courtesy of D.-G. Shu, from [84].)

(A)
Dorsal fin
Gut
Notochord and
vertebral elements
Eye.
(C)
Gill pouches'
Esophagus Ventral fin
Gonads
"Anus (?)
(B)
EVOLUTION 4e, Figure 17.11
© 2017 Sinauer Associates, Inc.

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