Number in parentheses indicates quantity of articles in that category.
- Biology and Life Science (109)
- Biochemistry, Molecular Biology and Biotechnology (4)
- Bioenergetics (cellular respiration: photosynthesis) (14)
- Botany, General Principles (3)
- Botany, Systems and Processes (12)
- Cell Biology (general and life processes) (26)
- Diffusion and Osmosis (6)
- Ecology and Environment (10)
- Embryology and/or Development (2)
- Evolution and/or Origin of Life (6)
- Fungi, Bacteria and Protists (2)
- Genetics and Heredity (14)
- Health and Disease (2)
- Taxonomy and Classification (5)
- Zoology Systems and Processes (circulation, digestion, excretion etc.) (13)
- Chemistry and Physical Chemistry Science (15)
- Acids, Bases and pH (2)
- Atomic Structure (1)
- Chemical Bonds (5)
- Chemical Reactions (2)
- Equations and Stoichiometry (1)
- Equilibrium (1)
- Gas Laws (1)
- Kinetics and Thermochemistry (2)
- Mixtures and Solutions (1)
- Periodic Table (1)
- States of Matter (2)
- Earth and Space Sciences (24)
- Astronomy (19)
- Meteorology (4)
- History of Science (6)
- Physics and Physical Science (40)