Which of following embryonic germinal tissue layers form all tissues and organs? 1. Endoderm 2. Mesoderm 3. Ectoderm 4. Mectoderm

a. 2 only
b. 2 and 3 only
c. 1, 2, and 4 only
d. 1, 2, and 3 only

ANS: D
The three embryologically distinct germinal tissue layers form all tissues and organs: endoderm, mesoderm, and ectoderm.

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The main heat dissipation mechanism that the body uses on days when ambient temperature exceeds body temperature is

A) evaporation B) convection C) radiation D) conduction

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The term _______________ describes the movement of molecules across a membrane down a pressure gradient from an area of higher pressure to and area of lower pressure normally resulting from hydrostatic forces

a. Filtration b. Carrier-mediated diffusion c. Active transport d. Osmosis

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