Answer:
true
Explanation:
The can be pressure which leads to stress
Heart Attack is a real emergency
My second choice is Blood
Iodine solution is used to test leaves for the presence of starch. You need to: heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions) heat it in boiling ethanol for a few minutes (this removes most of its colour)
Based on data it can change per time you do the experiment, thats why repetition is key to check for errors