What likely causes flea eggs to hatch in a previously empty apartment when new tenants move in?

Prepare for the Aptive California Field Representative Exam with in-depth questions and comprehensive explanations. Study with flashcards and multiple choice questions to excel in your exam!

The correct answer highlights the biological response of flea eggs to specific environmental stimuli. Flea eggs have a dormancy period during which they remain unhatched until they detect certain signals that indicate the presence of a potential host.

When new tenants move into an apartment, activities such as moving furniture, walking around, and other physical movements create vibrations that can simulate the presence of a host. Additionally, as humans enter the space, they produce body heat and exhale carbon dioxide, both of which are attractive to fleas. This combination of sensory cues prompts the dormant eggs to hatch, leading to a sudden increase in the flea population.

Other options, while they may seem relevant, do not directly address the immediate factors that trigger the hatching of flea eggs in such scenarios. For example, vacuuming can help remove existing flea eggs and larvae but is less likely to be a direct cause of hatching. High humidity levels can create a more favorable environment for flea development, but they are not the immediate triggers for hatching. Pets visiting the apartment may initially bring fleas, but without the presence of vibrations or body heat from new tenants, the eggs would remain dormant.

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