What might be a good metaphor for this statement? All the birds get fed when the corn gets crushed

Complete the sentence. the lower the hydrogen ion concentration, the the ph. higher lower closer to 7 closer to 0

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon