Fact 1: Playing is just one of many ways that mammals and other animals learn how to behave. Fact 2: People behave as a result of a complex interaction. Given the two facts above, what is a complex interaction shared by mammals and other animals?
Choose your answer from: 1). seeing. 2). firm hugs. 3). food. 4). staring. 5). power. 6). blinking. 7). sound. 8). playing.
Answer:
8).