They needed access to bodies of water for trade
<span>The best way to determing who is approaching before seeing them is to rely on other senses. For example, if your uncle never showers then you might be able to smell him even if you can't see him coming. In some cases it may also be possible to tell who is approaching by relying on knowledge about their habits. For example, if someone is coming through the door at six o'clock, and your father usually comes by at that time, then that person is probably your father.</span>
Answer: According to Piaget, May Lin's ability to use a doll as a representation of a real baby illustrates that she is capable of: SYMBOLIC FUNCTION.
Explanation: Symbolic function in Piagetian theory illustrates the ability of an individual to mentally use an object (the doll) to represent something that is not physically present (her baby brother).