During the final part of the first stage of labor, the contractions increase in intensity, often occurring every two minutes and lasting almost two minutes. This period is known as __________

Ideally, everything in the experimental situation EXCEPT the __________ is held constant

a) inferential statistics b) placebos c) independent variables d) hypotheses

In Jody's preschool classroom, teachers introduce activities that build on children's current thinking, challenging their incorrect ways of viewing the world

But they do not try to hasten development by imposing new skills before children indicate interest or readiness. This preschool emphasizes the Piagetian principle of A) sensitivity to children's readiness to learn. B) acceptance of individual differences. C) discovery learning. D) scaffolding.