The answer is C, because it has a negative charge -1. All groups with charges called ions, unless they are organic compounds.
Answer:
B. every cell of a multicellular organisms is responsible for movement
Calcium is a chemical element with symbol Ca and atomic number 20. Calcium is a soft gray Group 2 alkaline earth metal, fifth-most-abundant element by mass in the Earth's crust. The ion Ca2+ is also the fifth-most-abundant dissolved ion in seawater by both molarity and mass, after sodium, chloride, magnesium, and sulfate.[5] Free calcium metal is too reactive to occur in nature. Calcium is produced in supernova nucleosynthesis.
The answer is A because with rna G and C always go together and A and U always go together
