Which of the following animal groups, originating before the Paleozoic Era, is monoblastic, with one embryonic germ layer, but no organized digestive system, nervous system, or circulatory system?the acoelomate flatworms (like the planaria)the agnathan fishes (like the sea lamprey)the cephalochordates (like the lancelet)the urochordates (like the sea squirt)the poriferans (like the sponges)

All the organs of the body systems are formed from the germ layers. These germ layers are formed…

Answered: Which of the following animal groups,…

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter29: Vertebrates

Section: Chapter Questions

Problem 1VCQ: Figure 29.3 Which of the following statements about common features of chordates is true? The dorsal...

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Which of the following animal groups, originating before the Paleozoic Era, is monoblastic, with one embryonic germ layer, but no organized digestive system, nervous system, or circulatory system?
the acoelomate flatworms (like the planaria)
the agnathan fishes (like the sea lamprey)
the cephalochordates (like the lancelet)
the urochordates (like the sea squirt)
the poriferans (like the sponges)

Definition Definition Organ system that helps in the digestion of food by mechanical and biochemical processes. The digestive system breaks down food into simpler components that enable the body to then absorb or transport nutrients. The human digestive system includes the gastrointestinal tract or alimentary canal and the associate glands. The organs of the gastrointestinal tract include the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The associated glands include salivary glands, liver, gallbladder, and pancreas.

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