Endocrine Disruptors Practice Test

A chemical is detected in groundwater near a landfill. It resembles estrogen enough to bind estrogen receptors but produces a weaker response than natural estrogen, reducing the overall signaling when both are present. This chemical would best be described as:

A researcher studies two chemicals found in household dust: Chemical X binds to estrogen receptors and activates them; Chemical Y binds to estrogen receptors but prevents estrogen from activating them. Which pairing correctly identifies their endocrine-disrupting actions?