A day old chick. Image credit 21food.com ZIMSEC O Level Combined Science Notes: Growth and Development in Animals.
Coloured ink droplets falling and diffusing in a glass of water. Image credit pinterest.com ZIMSEC O Level Combined Science Notes:The movement of molecules
A bird pollinating a flower. Image credit gilligalloubird.com ZIMSEC O Level Combined Science Notes: Reproduction in plants: Examining adaptations of flowers to pollination
Materials: maize(male and female) or any type of grass flowers, bean flowers or any insect pollinated flowers, hand lenses, microscope slides, […]
Leach the soil ZIMSEC O Level Combined Science Notes: Comparing leaching in soils
Materials: soil samples, distilled water, burners, 3 beakers, measuring cylinders, cotton wool, filter funnel
Method 
Boil the filtrate
The three isotopes of hydrogen. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: Isotopes and the importance of proton numbers
The greater the depth of a beam the more load it can support ZIMSEC O Level Combined Science Notes: The relationship between a beam’s strength and depth
The reactivity series. Image credit wordpress.com ZIMSEC O Level Combined Science Notes: Experiment: Predicting reactions of a metal using the reactivity series
Burning sulpher ZIMSEC O Level Combined Science Notes: Experiment: Making acidic and alkaline solutions
Aim: To make acidic and alkaline solutions
Materials: sodium oxide, magnesium oxide, aluminium oxide, zinc oxide, unversal indicator, deflagrating spoon, sulpher, powdered carbon
Method
ZIMSEC O Level Combined Science Notes:Extraction of copper from sulphides
Sable chemicals plant. Image credit zimeye.net ZIMSEC O Level Combined Science Notes: Liquification of air
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