<u>Carbon is an essential element for all life forms on Earth. Whether these life forms take in carbon to help manufacture food or release carbon as part of respiration, the intake and output of carbon is a component of all plant and animal life. Carbon is in a constant state of movement from place to place.</u>
Answer:
c. Substance
Explanation:
A composition variable is an intensive property that indicates the relative amount of a particular species or substance in a phase.
Answer:
NaCl (Na is a metal and Cl is a nonmetal) MgO (Mg is a metal and O is a nonmetal) Al2O3, NaF, Na2O
Explanation:
You have to have a metal and a non metal together for it to be ionic
Noble gases are known for having a full outer shell of electrons which helium has as it has two electrons its first electron shell is completely filled