Final answer:
True - Children around six or seven years old generally have the physical ability to pedal and balance on a bicycle, which aligns with their developmental improvements during middle childhood.
Step-by-step explanation:
The statement that by age six or seven, children are usually capable of pedaling and balancing on a bicycle is true. Physical developments during the ages of six to ten include improvements in agility, balance, endurance, muscle strength, and coordination. This developmental period often sees children learning to ride a bicycle without training wheels. The skills necessary for riding a bicycle, such as the ability to pedal and balance, are typically acquired during middle childhood. Before this stage, at around the age of five, children may start learning to ride a bicycle with training wheels.