Which of the following is an internal framework of hard parts?

A. Endoskeleton
B. Vertebral column
C. Intervertebral disk
D. Hydrostatic skeleton
E. Exoskeleton


Answer: A

Biology & Microbiology

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All microorganisms require

A) carbon, iron, and sodium. B) phosphorus, aluminum, and sodium. C) calcium, potassium, and magnesium. D) phosphorus, selenium, and sulfur.

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Compare the efficiency of mammalian lungs versus fish gills

What will be an ideal response?

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The volume of air normally breathed in and out of the lungs in a single breath at rest is referred to as the

A. total volume. B. expiratory reserve volume. C. reserve volume. D. tidal volume. E. inspiratory reserve volume.

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Which of the following is NOT a component of a tropical marine ecosystem?

A. All of the answers are components of a tropical marine ecosystem. B. sunlight C. algae D. corals E. fishes

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