Development unfolds both [word1] and with a thoughtfully planned [word2] designed by adults.

The life stages of a low-mass star, starting with its birth and ending at its death are [life1], [life2], [life3], [life4], and [life5]. (Note that not all stages of life are given: just put the ones given in the proper order.)

The closest star to Earth is a few [option1] away.

A subgiant is a star with a [option1] and a [option2].

A substantial part of the day should be set aside for teacher directed activities and can be included in both indoor and outdoor environments.

The layer of the Sun that we perceive as the surface is the [option1], while the [option2] is the layer just above that.

Neutrinos produced in the core of the Sun during fusion [option1], and the photons produced during fusion [option2].

Suppose a planet is discovered orbiting a star in a highly elliptical orbit. While the planet is close to the star it moves [choice1], but while it is far away it moves [choice2].

The five essential elements of the ________ approach are active learning, classroom arrangement, the daily schedule, assessment, and comprehensive curriculum content. 

In this model, materials are designed so children, through observation, can see whether they have made a mistake while completing an activity.