insects
Source: This question is taken from the Everyday Science
Mercury
Rainfall
Three
Altering human beings by changing their genetic components
Clouds
Birds
Electrical Conductance
Primates
Iron
Wine
Polyvinyl chloride
Lycopene
Ancient Life and Fossils
Calcium oxalate
Fermentation
Cancer
Radioactivity
Moon
Atomic Clocks
Disease
seven colours
Computer science
Fungi
Death
Fruits
Ice and dust
60% Nitrogen, 40%inert gases