The Black Part of a Blackhead Is

question 40

Multiple Choice

The black part of a blackhead is

• A) excreted carbon.
• B) oxidized sebum.
• C) dirt.
• D) a growing hair stub.

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Definitions:

Windup Toy

A mechanical toy that is powered by a spring, which is wound by hand to generate movement.

Representational Thought

The ability to use symbols, signs, or internal images to represent objects, actions, or ideas that are not physically present.

Symbolic Play

Play in which one object stands for, or represents, another.

Circular Reactions

Repetitive actions carried out by infants, initially by chance and then intentionally, to explore and learn about their environment.