Which of the following are the fundamental embryonic tissues called the "germ layers"? 

A. tissues, organs, and organ systems
B. mesoderm, muscle, and tissue
C. ectoderm, endoderm, and exoskeleton
D. mesoderm, endoderm, and ectoderm
E. mesoderm, exoderm, and hydroderm


D. mesoderm, endoderm, and ectoderm

Biology & Microbiology

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a. Aveolate b. Ochrophyte c. Diatom d. Coccolithophore

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pH is a measure of

a. an enzyme's effectiveness. b. enzyme concentration. c. hydrogen ion concentration. d. none of the above.

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________ is a neurotransmitter released at every neuromuscular junction (the junction of a motor neuron and a skeletal muscle cell), where it triggers contraction of voluntary (skeletal) muscles

Fill in the blank(s) with correct word

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Streptococcus pyogenes is one of the most pathogenic microorganisms to human. Which of the following virulence factors produced by this organism can destroy both RBC and WBC?

A. Streptolysin B. Streptokinase C. Hemolysin D. Leukocidin E. More than one of the above answers are correct

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