A motorcycle must have two wheels and an engine and handlebars

If a child, below the age of six, first picks up a red box and then looks at a red ball, and then picks up a green ball and then picks up a black triangle, Vygotsky might say that he is using:

A) chain concepts B) sensory-motor skills C) color sequencing D) redundant information E) concept formation

Because scores on the Jackson Vocational Interest Survey do not change much over short periods of time, some degree of _____ exists

a) reliability b) construct validity c) concurrent validity d) all of the above