Concept explainers
Introduction: Chordates are species belonging to the phylum Chordata that at some stage during their development have four distinctive characteristics-a dorsal tubular nerve cord, pharyngeal pouches, a notochord and a postanal tail.
Answer to Problem 20A
Correct answer:
The correct answer is option (D) locomotion
Explanation of Solution
Explanation/justification for the correct answer:
Option (D) locomotion. A postanal tail is a structure that is mainly used for mobility, behind the
Explanation for incorrect answer:
Option (A) circulation. Chordates used postanal tail for mobility. So, this is an incorrect answer.
Option (B) digestion. In nonchordate, tails have internal portions of the digestive tract, and the anus is found at the end of the body. The postal tail is used to carry locomotives. So, this is an incorrect answer.
Option (C) flexibility. The notochord flexibility causes the body to stretch, instead of shorten, during muscle segment contractions. So, this is an incorrect answer.
Chapter 27 Solutions
Biology Illinois Edition (Glencoe Science)
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