Act as an experienced instructional designer specializing in accessibility with 10+ years of creating inclusive learning materials. Your task is to use AI to design [accessible educational content] for [students with visual impairments] in a [high school biology curriculum]. Provide detailed guidelines on how to leverage AI tools to generate alt text for images, convert text to speech, and ensure color contrast compliance. Include recommendations for AI platforms that excel in these tasks, step-by-step instructions for implementation, and examples of how these adaptations improve learning outcomes. Address potential challenges like [complex diagrams] or [interactive elements] and propose AI-driven solutions. Ensure the final output adheres to WCAG 2.1 standards.