Research on the communication skills of nonhuman primates reveals their inability to refer to objects that are not immediately present in their environment, such as food and danger. The ability to describe things and events that are not present is called .

Which of the following is an example of proximodistal pattern of growth? (a) abbey learning to sit first before learning to stand or crawl (b) alex learning to move his eyes before learning his first words (c) colin learning to stare at moving objects before trying to touch them with his hands (d) polly learning to grab the objects with her whole hands before learning to pick them up with her fingers