Table salt is sodium chloride (NaCl), composed of sodium and chlorine ions.

Kidneys filter waste products from the blood to produce urine. Each person typically has two kidneys.

The standard acceleration due to gravity at Earth's surface is approximately 9.8 m/s² or 10 m/s² for approximations.

Carbon dioxide (CO₂) is the primary greenhouse gas responsible for global warming. It traps heat in the atmosphere.

Table salt is sodium chloride (NaCl), composed of sodium and chlorine ions in a 1:1 ratio.

Vitamin D is synthesized in the skin upon exposure to ultraviolet (UV) radiation from sunlight.

Carbon has atomic number 6, meaning it has 6 protons in its nucleus. It is the basis of all organic compounds.

Water boils at 100°C (212°F) at standard atmospheric pressure of 1 atm or 101.325 kPa.

Coal is a fossil fuel and non-renewable energy source. Solar, wind, and hydroelectric are renewable sources.

Diamond is the hardest naturally occurring substance, rating 10 on the Mohs hardness scale.