Because an organ is a group of tissues that work together for the overall function of the organ, and an organ system is a group of organs that work together to perform a specific function.
The correct answer is B.
When testing the effectiveness of a drug a method is used whereby two groups of people are administered a drug. One will be given the real drug and the other will be given a placebo which is usually a sugar pill. Results from both groups will be collected and used to establish whether a true effect of the actual drug has taken place.
Answer:
try making it fun so you don't exhibit boredom.
Explanation:
I hope this helps. :)
