- Wood
- Copper
- Iron
- Water
- Wavemet er
- Viscometer
- Wattmet er
- None of these
- Stroboscop e
- Heliograph
- Solograph
- None of these
- Oxytocin
- Melatonin
- Adrenalin
- Renin
- Hepatic Bile
- Gastric Juice
- Saliva
- Pancreatic Juice
- Pancreas
- Thyroid
- Pituitary
- Spleen
- Nitrous Oxide
- Methane
- Carbon Dioxide
- Carbon Dioxide & Nitrous Oxide
- Ammonia
- Hydrogen
- Nitrogen
- Carbon Dioxide
- Sound cannot travel through a vacuum
- Sound cannot travel through gases
- Sound cannot travel through liquids
- Sound cannot travel through solids
- Aluminium
- Gold
- Graphite
- All are conductors
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