Answer:
1 factor deffer which is independent variable which is controled in control groups
If you add the amount of protons with the amount of neutrons, you get the atomic mass. Sodium has 11 protons, and 12 neutrons. 11+12=23
Calcite occurs in igneous, metamorphic, and sedimentary rocks and is the most commonly encountered carbonate mineral.
I believe the answer you're looking for is fertilization. :D
