Explanation:

• Antibiotics: While antibiotics are a result of biotechnology, their primary use in agriculture is limited. They are more commonly associated with medical biotechnology.
• Vaccines: Biotechnology is extensively used in developing vaccines, including for agricultural purposes, such as vaccines for livestock and poultry.
• Nutrient Supplementation: Biotechnological methods are employed in developing various nutrient supplements for crops, enhancing their growth and nutritional value.
• Manufacturing Power Fibers: This does not seem directly related to agricultural biotechnology. Power fibers are more associated with materials science and industrial manufacturing.
• Based on this analysis, two of the items listed (Vaccines and Nutrient Supplementation) are direct results of the application of biotechnology in agriculture.