Well if you mean what does the controlled part of a scientific investigation, it is the part of the investigation that will be your control or your base, untouched, original, data and such.
The times of moonrise and moonset are based on ideal situations. The time of moonrise is calculated based on the fact, when the top part of the moon is above the horizon. The moonset time is considered as the time when the moon is just about to go below the horizon. I hope the answer helps you.
The statement is true.
As weird as it may sound, helium was indeed first discovered on the Sun, and after some time on Earth. The first evidence of helium was observed on August 18 1868, as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the Sun's chromosphere. This line has been detected by a French astronomer by the name of Jules Janssen during a total solar eclipse in Gantur, India.
Answer: Most likely B, Cost and time.
If I was transporting goods, I wouldn't want to pay more than I need to.
Hope this helped.
The answer is true it can be traced to one particular reason.
