Overview
Biology studies organisms and the processes that sustain and connect life. It spans molecular reactions, cellular organization, development, physiology, behavior, and ecosystems. Biologists ask how structures function, how traits are inherited, and how populations change. Explanations often connect several levels: an environmental change may alter gene expression, organism performance, and ecological relationships.
Core ideas
Cells provide basic organization, while DNA stores hereditary information expressed through interacting molecular systems. Evolution involves changes in populations across generations, including natural selection and genetic drift. Energy flows through living systems, and matter cycles. Biological traits commonly reflect interactions between genes and environments rather than a simple opposition between nature and nurture.
Try it
Observe germination using several beans on damp paper in transparent containers. Keep conditions similar and record when roots and shoots appear. Measure growth without damaging seedlings, and note variation between individuals. Use enough observations to avoid relying on one unusually fast seed. Dispose of moldy materials safely rather than culturing or handling unknown microorganisms.
Study pathways
Further study includes molecular biology, ecology, biotechnology, conservation, teaching, and laboratory research. Chemistry, statistics, and careful documentation strengthen preparation. Medical diagnosis, genetic counseling, and clinical laboratory work require additional regulated qualifications. Field and laboratory activities may need permits, biosafety training, or ethical approval, particularly when they involve animals, human material, or sensitive habitats.