All systems are dependent of each other. For example, the Digestive system shut down the body wouldn't get the energy required so the whole body would shut down. If the circlatory system shut down, the body wouldn't get oxygenated blood to the body so again, everything would shut down. If the respiratory system shut down, oxygen couldn't be taken into the blood and you guessed it, the body would shut down. If the Immune system shut down, simple illnesses like the cold or fever who be very dangorous to the body's health. Lastly, if the excretory system shut down, there would be no why to get the waste from the body out.
Hope this helped ( Sorry I couldn't answer the last question, I didn't have time )
Answer: representative data
When designing an experiment a benefit of larger sample sizes would be more representative data. This larger sample size would lead to perfect result.
Your answer is true
Hope this helps <3
By their activity in the soul