Round two's answers. Hydrogen is the lightest substance, iron is Fe, and roughly 80 percent of the brain is water.
The pistil is the female part of a flower, the five senses are hearing, sight, smell, touch and taste, the aorta carries blood from the heart, and mercury is liquid at room temperature.
- Hydrogen
- Fe
- Water
- Pistil
- Hearing, sight, smell, touch and taste
- The Aorta
- Mercury
- Carbon dioxide
- Helium
- Iron
- A barometer
- Oxygen and Hydrogen
- Carbon Monoxide
- Thomas Edison
- Vitamin D