Pregnant women need an additional kilocalories per day during the second trimester.

b. 340
c. 400
d. 500

Explanation:

According to eatright, women before pregnancy need between 2,200 and 2,900 calories per day. When they are pregnant an increase in calories is shown because of the baby, who also needs calories to live. The first trimester of pregnancy doesn't require extra calories, but the second trimester is recommended around 340 calories more per day. The, the third trimester is recommended around 450 calories more.

example of simple carbohydrates:

examples of complex carbohydrates:

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there