I believe it is the first one but I am not 100% sure
They are mostly made out of protein fiber.
Answer:
Spider has a circulatory system
The best answer to go with is b
Answer:
Biuret solution is used to identify the presence of protein. Biuret reagent is a blue solution that, when it reacts with protein, will change color to pink-purple. Sugar with Benedict's solution. Protein with Biuret solution.Aug 10, 2020
