Final answer:
The 1968 'Blue Marble' photo from the Apollo missions made Earth seem small and vulnerable, changing people's perception of the planet as finite and precious, and fostering a global perspective.
Step-by-step explanation:
The image taken during the Apollo lunar missions in 1968 was a transformative view of Earth from space, often referred to as the 'Blue Marble' photo. Earth appeared as a small, fragile sphere set against the vastness of space. This image heightened the awareness of the Earth's vulnerability and the finite nature of its resources, marking a significant shift in the way people perceived our planet. Option b.) 'Earth was thought to be huge with unlimited resources, but this image made the Earth appear small and vulnerable' best describes how the image changed people's feelings about Earth. It was a pivotal moment in human history that fostered a global perspective, helping to appreciate the uniqueness of our planet and emphasize the importance of taking care of it.