Concept explainers
Introduction:
Cnidarians (coelenterate) is a group that consists of more than 9,000 living marine species in it. For examples: Corals, hydras, jellyfish, sea pens, sea whips and sea fans.
Answer to Problem 29A
Correct answer:
The correct answer is option (c).
Explanation of Solution
Explanation/justification for the correct answer:
Option (c) Cnidarians has evolved from the
Explanation for incorrect answer:
Option (a) Cnidarians has evolved from the flatworms not from Sponges as Sponges of the kingdon Porifera have evolved to some non-bilateral animals.
Option (b) Cnidarians has evolved from the flatworms not from multicellular choanoflagellates, as multicellular choanoflagellates are non-trophic and evolved to aerial spore dispersal.
Option (d) Cnidarians has evolved from the flatworms not from animals with bilateral symmetry, as animal with bilateral symmetry is the same structure of an animal when seen in two equal halves as can be noticed in a butterfly.
Cnidarians has evolved from the flatworms, as just like cnidarians, flatworms also have a
Chapter 24 Solutions
Biology Illinois Edition (Glencoe Science)
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