Algebra-1

Question Analysis
This question involves identifying causation in a controlled microbiology experiment.
The main focus is on recognizing that deliberate exposure to antibiotics (the cause) directly leads to reduced bacterial population (the effect), with a known biological mechanism.

Key Concept Explanation
Causation is confirmed when a variable (antibiotic exposure) is manipulated, and a corresponding change in another variable (bacterial population) is observed, explained by a scientific mechanism (antibiotics target and kill bacteria).
The control group (unexposed bacteria) rules out other factors (e.g., natural population decline), proving the antibiotic is the cause.

Step-by-Step Solution
Analyze the experiment: One group is exposed to antibiotics (treatment), and the other is not (control), isolating the effect of the antibiotic.
Evaluate the mechanism: Antibiotics are scientific...