scaffolding
building on what you already know
heart rate of an infant
140/160 min
heart rate for toddler
80/130 min
heart rate for preschool age
80/120 min
heart rate for school age
70/110 min
heart rate for adolescence
55/105 min
heart rate for early adulthood
average 70/ min
who begin to involve themselves with peers in their group
preschool age