Which of the following systems is the first to begin
development in the human embryo?
a. nervous system
b. excretory system
c. reproductive system
d. skeletal system
e. endocrine system
Answer: a
Biology & Microbiology
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A. are disrupted by treatment with lysozyme or penicillin. B. include orthomureine. C. are similar to those of gram-negative bacteria. D. lack murein and D-amino acids.
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Which of these animals is a living representative of the Sphenodontids?
1.box turtle 2.Komodo dragon 3.rattlesnake 4.tuatara
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The ___________ controls the amount of food that moves back up the esophagus.
A) duodenum B) cardiac sphincter C) gastric mucosa D) pyloric sphincter
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Lipids are the only class of macromolecules that contain
A. nucleotides. B. monosaccharides. C. amino acids. D. fatty acids. E. phosphate groups.
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