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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Question

Transcribed Image Text:3 (8.B)
A student collected the animal shown below on a field trip. The student used a dichotomous key and a
microscope to classify the animal.
Step
Characteristic
Identification
Go to 2
la Possesses segmentation
1b Lacks segmentation
2a Has an exoskeleton with jointed appendages
Has no exoskeleton, unjointed appendages
(if any present), and a segmented worm-
Go to 3
Phylum Arthropoda
2b
Phylum Annelida
like body; is possibly in a tube (if in a tube,
may have tentacles)
Possesses a foot, a radula, arms, and/or
За
a shell
Phylum Mollusca
Lacks all of the above and is dorsoventrally
3b
Phylum Platyhelminthes
flattened
How should this animal be classified?
A Arthropoda
C Mollusca
B Annelida
D Platyhelminthes
silominA
istockphoto.com/Nancy Nehring
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