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On average, children begin saying recognizable words at about:

When infants turn their heads and suck in response to a touch of the cheek, they are demonstrating the:

A parent and a toddler meet someone the toddler does not know but who makes the parent nervous.  The toddler will probably:

During the sensorimotor stage, the main task is to:

The sense that is the least developed at birth is:

Tammi, age 4 months, and Dawn age 13 months, are left with a baby-sitter.  How will they react?

Tori is very good at large body movements, like walking and jumping. Because these actions use large muscle groups, they are called:

Research has found that “baby talk” is:

A typical activity of the oral stage is:

Tasmanian devils once inhabited most of present-day Australia, but only an isolated population on the island of Tasmania has survived to the present day. Which of the following processes has likely affected Tasmanian devils as a result of this history?