Thermometer ruler meter stick :}
It's important because it is easy to apply it too tightly and impede circulation. Allows for smoother fit and prevents gaping caused by variation in contour of the limb.
ANSWER
number 1. B
number 2. A
im not 100% sure so please think about it before answering.
Answer:
It helps organisms survive.
Explanation:
To elaborate, adaptive traits and behavior is learned because of a necessity to <em>survive</em>.
A good example might be vaccinations and your immune system. Your body needs exposure to a pathogen to learn what it does, then adapts to fight off the pathogen. It adapts to survive.
In a constantly changing world, if you can't adapt, you simply won't survive long enough.