What are symptoms of crohn's disease?

Which of the following is an argument against buying local fruits and vegetables?

Describe factors that can make dishes in restaurants have nutritional values

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.