Although an infant's color vision is not as sensitive as an adult's, it is generally believed that babies have good color vision by five months of age. Most babies start crawling at about 8 months old, which helps further develop eye-hand-foot-body coordination.
A language tree, or family tree with languages substituted for real family members, has the form of a node-link diagram of a logical tree structure. Such a diagram contains branch points, or nodes, from which the daughter languages descend by different links.
The root node, at the top, has no parent. In computer science, a tree is a widely used abstract data type (ADT)âor data structure implementing this ADTâthat simulates a hierarchical tree structure, with a root value and subtrees of children with a parent node, represented as a set of linked nodes.