This is a scientific test done under controlled conditions where just one or a few factor are changed at a time, while all others are kept constant.
A. laboratory test
B. controlled experiment
C. chemical experiment
D. science experiment
Answer:B
This is a scientific test done under controlled conditions where just one or a few factor are changed at a time, while all others are kept constant.
A. laboratory test B. controlled experiment C. chemical experiment D. science experiment