Answer:
There aren't any reactants here
Statements A, B and D are correct.
Statement C is incorrect as hydrogen atoms are also present.
Order- as seen in the picture here.
I believe it is C) calcium-rich plates echinoderms and B) bones in mammals like vertebral
11. Yo compro el carro para Pablo. Yo se lo compro. - lo is used for masculine nouns
12. Ella da el papel a ti. Ella me lo da.
13. Ella compra la manzana para Javier. Ella se la compra.
14. Nosotros vendemos el pan a las personas. Nosotros se lo vendemos.