The scientific method ________.

Find the best description.

The presence of a membrane-enclosed nucleus is a characteristic of

In an atom, the number of neutrons determines most specifically the ________.

A well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observations and experiments, is referred to as ________.

The number of electrons of an atom determines its ________.

You wake up one morning feeling slightly under the weather. A close family member enthusiastically suggests that you take some Echinacea, an herb commonly used as a cold remedy. You then decide to design an experiment to test Echinacea and see if this claim is true. You think, "If taken at the beginning of a cold, Echinacea will reduce cold symptoms." Your statement, "If taken at the beginning of a cold, Echinacea will reduce cold symptoms," is called ________.

A controlled experiment is one in which ________.

The statement, "There are 628 gray rats living under the bridge," describes the ________ of gray rats under the bridge.

What is typically the first step in the scientific method?