What technique was used to visualize the fingerprint relevant to the Madrid case and what are its limitations?

Which is true of the reactants in this displacement reaction? fe + 2hcl fecl2 + h2 a. the reactants are located to the left of the arrow in the chemical equation. b. the reactants contain 1 iron atom, 2 hydrogen atoms, and 1 chlorine atom. c. the reactants are the atoms, molecules, or compounds formed in the reaction. d. the reactants have the same physical and chemical properties as the products.

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Avariable that is not being directly tested during an experiment should be