Biology
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Human body — organs, blood, digestion, glands
Body mass index
\text{BMI} = \frac{\text{mass (kg)}}{\text{height (m)}^{2}}
Mass in kilograms divided by height in metres squared. 18.5–24.9 is the normal range (WHO)
Classification, plants, hormones and animal facts
Photosynthesis
6CO_2 + 6H_2O \xrightarrow[\text{chlorophyll}]{\text{sunlight}} C_6H_{12}O_6 + 6O_2
O₂ comes from water. Inputs are carbon dioxide and water. Outputs are glucose and oxygen
Aerobic respiration
C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy (ATP)}
The reverse of photosynthesis in terms of matter. It releases energy as ATP
Branches of biology and ecology
10% law of energy transfer
E_{n} = E_{1} \times (0.1)^{\,n-1}
E₁ = energy at the producer level, n = trophic level. Each step keeps one tenth