Match these items.
1. an atom that has gained or lost electrons
2. produces oh ions when added to water
3. produces h' ions when added to water
base
ion
acid

an atom that has gained or lost electrons -ION

produces OH ions when added to water -BASE

produces H' ions when added to water-ACID

Explanation:

An ion is an electrically charged particle that is formed by the loss or gain of electrons. Elements lose or gain an electron in order to attain stability forming ions.

Bases are the substances that produce hydroxide ions (OH-) when added to an aqueous solution or water. This is because the compounds contain  a hydroxyl.

Acids are the substances which produce hydrogen ions( H+) when added in an aqueous solution or water. This is because the compounds contain hydrogen ions.

explanation:

the sequence of amino acids in a protein determines its function. the dna sequence of a gene determines the amino acid sequence of the resulting protein. thus, any changes in dna sequence can result in changes in protein function. this is called a mutation.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.