It is located in the trachea
Had to look for the options and here is my answer:
Drosophila is considered as a specie of flies, often known as "fruit flies". In their development, the influence of the bicoid protein differs along the axis of the embryo because of the presence of <span>an anterior to the posterior gradient in BICOID protein concentration in the embryo. Hope this helps.</span>
Answer:
photosynthesis that's the answer
