Adenine
Guanine
Cytosine
Thymine
Nitrogenous bases
Explanation:
Rock fragments squeeze together
Sodium, potassium, chloride and calcium ions are important for establishing the resting potential of the cell. The sodium-potassium gradient is maintained by a pump which transports 2 potassium inside the cell and 3 sodium ions outside the cell.
I think sister groups. Imagine them having the same parents.
