Which plant cell structure stores large amounts of chemicals—including salts, minerals, proteins, and water—for the cell and the cell maintain its shape? plastids chloroplasts central vacuole cell wall

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.