Philosophical schools are distinct traditions or approaches to fundamental questions about existence, knowledge, values, reason, mind, and language. They offer frameworks for understanding reality and human experience. Idealism, Realism, and Pragmatism are all well-established and influential philosophical schools. Idealism posits that reality is fundamentally mental or spiritual; Realism asserts that reality exists independently of human consciousness; and Pragmatism emphasizes the practical consequences and utility of ideas as criteria for truth.
Biology, however, is not a philosophical school. It is a natural science concerned with the study of life and living organisms, their structure, function, growth, origin, evolution, and distribution. While biology can inform philosophical discussions (e.g., about the nature of consciousness or ethics), it is an empirical discipline that relies on observation and experimentation, distinct from the conceptual and theoretical inquiry characteristic of philosophy. Therefore, biology stands apart as a scientific field rather than a school of philosophical thought.