I believe the correct answer from the choices listed above is the first option. The chemical that promotes phototropism is auxin. Phototropism is the growth of an organism which responds to a light stimulus. Auxins are plant hormones that are used in growing.
Answer from: Quest
the bald eagle got 50 because everything gets 10% of what they consume and since 50 is ten % of 500 hundred that means the grasshopper had to have consumed a plant with 5,000 calories of energy