A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records. A primary key's main features are: It must contain a unique value for each row of data. It cannot contain null values.
Answer:
gases
Explanation:
one strength would be that the graph clearly shows the gases and pathway of the gases which are taken in and used in exhalation.
Well like bananas grow side by side as in pairs but I don’t know if it has to be pairs of 2
<span> The </span>agents of metamorphism<span> include heat, pressure (stress), and chemically active fluids.</span>
Fill in the first blank with lithosphere and the second blank with asthenosphere to make the sentence true.
