How can you make a debate introduction for biology?

I would assume it works the same way as a regular debate... So a debate introduction would include you opinion (or assigned side of the debate) of the topic, such as the pros or cons of the topic (biology).

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.