The element(s) that have proven useful for stable isotope studies are

A) carbon.
B) nitrogen.
C) sulfur.
D) carbon, nitrogen, and sulfur.


Answer: D

Biology & Microbiology

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Which superkingdom contains members that are responsible for forming red tides?

A. Amoebozoa B. Archaeplastida C. Stramenopila D. Alveolata E. Excavata

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Which of the following phrases INCORRECTLY finishes the following statement regarding morphogen distribution? Morphogen distribution inside the cell

A. is homogeneous. B. can be established prior to fertilization of the oocyte. C. can arise due to localized secretion by neighboring cells. D. is dependent on CAMs. E. is neither homogeneous nor dependent on CAMs.

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The part of the human eye that contains the

photoreceptors is the

a. lens. b. pupil. c. cornea. d. sclera. e. retina

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This animal is:

1.Acoelomate 2.Coelomate 3.Pseudocoelomate 4.Radial

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