Question

radon seeps out of the ground. where is it most likely to accumulate in homes? basements attics

Explanation:

Radon is a radioactive gas that is denser than air. Basements are typically lower - level areas in homes. Since radon is denser than air, it will tend to sink. Basements are more likely to have poor ventilation compared to attics (which are upper - level and may have better air circulation due to heat rising). Also, basements are in closer proximity to the ground from which radon seeps.

Answer:

Basements