Notes on Scientific Inquiry and Biology

The Nature of Science

  • Humans possess a spirit of inquiry, driving scientific exploration.

  • Scientific thinking is objective and prioritizes evidence.

Scientific Principles

  • Natural causality: Events traceable to natural causes.

  • Natural laws apply universally and timelessly.

  • Scientific inquiry assumes uniformity in human perception of natural events.

Science as Knowledge and Process

  • Science = body of knowledge + evidence-based process.

  • Focuses on the natural world, relies on observation and experiments, independent validation, peer review, and self-correction.

  • The scientific method underpins scientific discovery.

The Scientific Method

  • Steps: Observations ➔ Hypothesis ➔ Predictions ➔ Testing (validate/reject hypothesis).

  • Must be objective, requiring reproducibility and peer verification.

Observations

  • Fundamental to science: descriptions or measurements of phenomena.

  • Must be reproducible to be valid.

Hypotheses

  • Must be testable and falsifiable; informed and logical explanations.

  • Tested through observational or experimental studies.

Experiments

  • Evaluate causality by manipulating independent variables.

  • Controlled experiments measure dependent variables under varied conditions.

Scientific Assertions

  • Hypotheses supported but never proven with absolute certainty.

  • Scientific knowledge is provisional and open to challenge.

Scientific Theories and Facts

  • Theories: Well-tested hypotheses accepted as best explanations.

  • Facts: Direct, repeatable observations.

Importance of Studying Biology

  • Relevance: Medical advances, addressing ecological challenges, and biotechnological innovations.

  • Potential controversies: Endangered species, biomedical ethics, food safety.

Characteristics of Living Things

  1. Complexity and Organization: Life is organized from atoms to biospheres.

  2. Response to Stimuli: Living things react to environmental changes.

  3. Homeostasis: Maintain stable internal conditions.

  4. Energy Use: Obtain materials and energy from the environment.

  5. Growth: Convert environmental molecules into body molecules.

  6. Reproduction: Propagate genes, DNA as hereditary molecule.

  7. Evolution: Adaptation through natural selection leads to genetic evolution.