What Key Developmental Task Initiates the Beginning of the Embryonic

question 36

Multiple Choice

What key developmental task initiates the beginning of the embryonic stage?

• A) The placenta becomes functional
• B) The beginning of the fetal heartbeat
• C) The formation of the germ layers
• D) The development of a yolk sac

---

Definitions:

Method of Limits

A psychological research method used to measure sensitivity to stimuli by gradually increasing or decreasing the stimulus intensity until it is detectable by the participant.

Adjustment

The process of adapting or becoming accustomed to new conditions or to a new environment.

Weber's Law

A rule which asserts that the minimal discernible change in a stimulus is a constant proportion of the initial stimulus.

Just Noticeable Difference

Just noticeable difference is the minimum difference in stimulation that a person can detect 50% of the time, also known as the threshold of sensory detection.