Which of these is the best explanation of how a smooth round stone became smooth? - CORRECT
ANSWER It was in a stream for a long time
When a lobster grows a claw to replace one that was lost, the process is called - CORRECT ANSWER
Regeneration
Any astronomical body that revolves around a larger body is called - CORRECT ANSWER A satellite
In chemistry, to be classified as an organic substance, a substance must contain - CORRECT ANSWER
Carbon atoms
Which elements does NOT contain any neutrons? - CORRECT ANSWER Hydrogen
The chemical formula of a compound describes the elements the compound contains and the - CORRECT
ANSWER Ratio elements in the compound
What is the symbol for hydroxyl ion? - CORRECT ANSWER OH-
The tympanic membranes are also known as the - CORRECT ANSWER Ear drums
Which of the following action produce a chemical change? - CORRECT ANSWER Adding salt to a hot
water
Choking is prevented by the - CORRECT ANSWER Epiglottis covering the voice box
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