Helium was discovered in 1868.
I'll go with B, have a good day
Answer:
Relating to, measured from, or as if observed from the earth's center.
Answer:
STP in chemistry is the abbreviation for Standard Temperature and Pressure. STP most commonly is used when performing calculations on gases, such as gas density. The standard temperature is 273 K (0° Celsius or 32° Fahrenheit) and the standard pressure is 1 atm pressure.
Answer:
Carbon dioxide and water I believe because it is a combustion reaction
