Biological theories explain behavior and mental processes through the lens of biology. They focus on how genetics, brain structures, and neurotransmitters influence actions and thoughts. For example, the nature vs. nurture debate examines the impact of inherited traits versus environmental factors on development. One prominent biological theory is the evolutionary psychology perspective, which suggests that certain behaviors have evolved to enhance survival and reproduction. This approach looks at how traits like aggression or altruism may have been advantageous in our ancestral environments, shaping human behavior over time.