Select the choice that correctly associates the organ with its embryonic sources
A) anterior pituitary gland â€" mesoderm and endoderm
B) thyroid gland â€" mesoderm and ectoderm
C) adrenal gland â€" ectoderm and mesoderm
D) skin â€" endoderm and mesoderm
E) brain â€" mesoderm and endoderm
Answer: C
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Abiotic components of an ecosystem include
A. only animal life. B. both living and nonliving components. C. living components only. D. nonliving components only. E. all components except animal life.
The portion of the DNA molecule that is
translated is composed of a. introns. b. anticodons. c. exons. d. transcriptions. e. exons and transcriptions.
Speciation caused by a change in the course of a
river is an example of __________ speciation. a. divergent b. parapatric c. allopatric d. convergent e. sympatric
Octopuses and squids, like vertebrates, have
a. simple eyes. b. ocelli. c. ciliary eyes. d. compound eyes. e. “camera” eyes.