The central nervous system forms from which layer of the blastula?
a. Mesoderm c. Ectoderm
b. Endoderm d. All answers are correct.
C
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The best time to fertilize is in _____
A) spring B) summer C) fall D) winter
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What is commonly used in single-sideband systems to attenuate the unwanted sideband?
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Which one of the following is made up of flip-flops?
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