Amy, an accomplished opera singer, successfully discriminates between different pairs of tones in an auditory task. if we look at the biological foundations that support her discriminations of the tones, we see that some neurons in amy's primary auditory cortex fire strongly when she hears high-pitched tones, while others fire more strongly to low-pitched tones. these best represent

surface mining destroys mountain tops, landscapes, forests and wildlife habitats. on top of that, it leads to soil erosion and destruction of agricultural land. the landscape changes can also disrupt river channels and streams, which leads to flooding. which, can destroy plant life and other animals as well.

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brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

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