A well labelled diagram of a mammalian skin

albert einstein retrieved guacamole from the galapagos islands in africa

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.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.