At which gestational week does sexual differentiation begin in humans?

a. 5
b. 7
c. 10
d. 12
e. 14


ANSWER: b

Biology & Microbiology

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Which of the following represents the correct order of vertebrate gastrointestinal tract layers, going from outside the tract to inside the tract? 

A. the serosa, submucosa, and the lumen B. the submucosa, the mucosa, the lumen, the plexuses, and the serosa C. the serosa, the mucosa, and the submucosa D. the serosa, submucosa, and the mucosa E. the mucosa, the plexuses, and the serosa

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The human body requires about ____ of fat each day to stay healthy

a. 1 teaspoon b. 4 teaspoons c. 1 tablespoon d. 4 tablespoons e. 1 cup

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Both echinoderms and chordates are deuterostomes. This means that

What will be an ideal response?

Biology & Microbiology