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,…

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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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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