Final answer:
The best conclusion is that the butterflies migrate to Santa Cruz to survive the winter.
Step-by-step explanation:
The best conclusion the students can make based on these observations is that the butterflies migrate to Santa Cruz to survive the winter. Monarch butterflies are known to undertake long-distance migrations to avoid harsh weather conditions. They travel from colder regions to warmer regions, such as Santa Cruz, where they can find suitable resources and a more favorable climate during the winter months. Santa Cruz provides the butterflies with a safe haven for survival, allowing them to mate and lay their eggs.
Learn more about Monarch butterflies migration