Your friend has signed up for a dance class and thinks you should join to get more cardio exercise. what type of peer pressure is this? positive negative destructive neutral

What is the main difference between trace elements and the main elements that make up the body? 1) main elements consist of heavier atoms. 2) trace elements are only needed in small amounts. 3) trace elements consist of heavier atoms. 4) main elements are only needed in small amounts.