What is the boiling point of 2 cups appear of tap water with one tablespoon of salt

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins

Linda and julia are trying to determine whether their ideas are scientific or pseudoscientific. linda's idea is free of bias. julia's idea gives the same result when tested repeatedly. which statement is correct about linda and julia's idea?