Answer:
B
Explanation:
B It’s a physical change because the water and the salt kept their original properties.
Answer:
temperature
Explanation:
Celsius is a unit of temperature. Another example of this would be Kelvin or Fahrenheit.
Answer:
They conducted it from earth
Explanation:
There had never been anything capable of observing it from space launched at that time because Sputnik wasn't even launched
4.88x10^20 H2O2 molecules
