Nine-Year-Old Ryan Thinks Through a Series of Steps and Then

question 39

Multiple Choice

Nine-year-old Ryan thinks through a series of steps and then mentally reverses direction, returning to the starting point. Ryan is capable of

• A) conservation.
• B) reversibility.
• C) decentration.
• D) seriation.

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Definitions:

Vasoocclusive Pain

Pain resulting from the blockage of blood vessels due to sickle-shaped red blood cells, common in sickle cell disease.

Penicillin

A group of antibiotics derived from Penicillium fungi, first discovered by Alexander Fleming in 1928, used to treat bacterial infections.

Severe Combined Immunodeficiency Syndrome

A rare genetic disorder that results in an extremely weak immune system, making the body highly susceptible to infections.

Humoral Immunity

An aspect of the immune system mediated by molecules in the blood or mucosal secretions, including antibodies produced by B cells, that fights against pathogens.