Answer:
When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.
Answer: An independent variable, sometimes called an experimental or predictor variable, is a variable that is being manipulated in an experiment in order to observe the effect on a dependent variable, sometimes called an outcome variable.
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Explanation:
under what circumstance does a negative cell presents An antigen to another negative cell
A plate is what the continents and other pieces of earth sit on. They are what cause earthquakes.
A species is the same animal while a kingdom is a varitie of species