Final answer:
Proteins like Hemoglobin, Collagen, and Amylase are visible examples that perform crucial functions such as oxygen transport, structural support, and digestion of starch respectively.
Step-by-step explanation:
Examples of proteins that can be "seen" in the world around us include:
- Hemoglobin - Functions in oxygen transport within the blood, allowing oxygen to be carried from the lungs to tissues throughout the body, and carbon dioxide from tissues back to the lungs.
- Collagen - Provides structural support to connective tissues, and is a major component of tendons, cartilage, bone, and skin.
- Amylase - An enzyme that facilitates the breakdown of starch into sugars during digestion, acting as a catalyst to speed up chemical reactions.
All the above options (A, B, C) are correct as they are all proteins with different functions critical to the body's operation.