A botanist is trying to isolate all of the auxin produced in a bean plant by extracting it from seedlings in a range of developmental stages.Which aspect of plant hormones must the scientist take into consideration while planning the extraction protocol?
A) They have a single specific role. B) They affect mainly the cells that produce them. C) They are species-specific. D) They are produced in many different parts of the plant. E) They elicit rapid responses.