How does the mass of and distance between the Sun and the Earth impact the number of days in a year?

Ahypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment. the long side of a right triangle. a synthesis of a large collection of information that includes guesses.

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

The discovery of the electron as a subatomic particle was a result of