What Are the Germ Layers, and from What Do They

question 29

Multiple Choice

What are the germ layers, and from what do they arise?

• A) The germ layers are an inner cell mass that flattens to form the embryonic disc.
• B) The germ layers are an inner cell mass that separates from the trophoblast to create the amniotic cavity.
• C) The germ layers are shoots sent out by the trophoblast to gain nourishment from the endometrium.
• D) The germ layers are three layers that arise from the embryonic disc and produce all the organs and tissues of the body.

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Definitions:

Experimental Research Design

A scientific method in which variables are manipulated and controlled to establish cause-and-effect relationships between them.

Ethical

Concerned with or relating to ethics or the standards of right and wrong behavior.

Cause and Effect

A relationship in which one event (the cause) makes another event happen (the effect).

Placebo Effect

The phenomenon where patients experience real improvements in their condition after receiving a treatment that has no therapeutic effect.