One common analogy used to illustrate the nature of genetic material involves comparing the different components of genetic material to a textbook. match the genetic terms to the best textbook component to show that you understand these terms as they relate to one another.

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.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.