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.
It’s the second one. In photosynthesis plants take carbon dioxide and water to make glucose and oxygen. Hope this helps!
Idk but you can ask google and I'm sure they will tell you
G-C A-U therefore it’s “A.uracil”.
D I think hope this helps
