To investigate whether roots exert a pushing force strong enough to cause water to move up the stems plants, my question is state and explain 4 precautions to be considered during the setup of this experiment

for a different answer set the answer would be because the oxygen in the water had depleted (apex)

i took a test for bio that had this question and these were the correct answers, not sure if this is any now lol

the nervous system and the muscular system work together.  

sweat reaches the surface of the skin and evaporates into the air.

muscles underneath the skin relax, causing hair on the skin to lay flat.