Passage Summary: Mice used in medical studies are usually kept in tiny cages that aren't good for them. Since animals need a natural environment for research to be accurate, these studies might have some issues.

Reasoning: Research mice live in abnormal environments, and abnormal environments make animal research less reliable.

Analysis: We need to combine these facts to find a logical deduction. If lab mice are in abnormal environments (small cages) and abnormal environments diminish research reliability, then it follows that the reliability of research using these mice is currently diminished. This is a transitive relationship: A (lab mice) are in B (abnormal cages), and B leads to C (less reliability), so A leads to C. Look for an answer that stays strictly within these bounds without adding outside assumptions about the intent of the researchers.