She could consume calories that are greater than 1500 because the baby within her womb will be taking in some calories for him/herself and leave the mother with less food being digested for herself.
Gases can be produced by normal flora (bacteria that normally lives in the intestines) and harmful bacteria as well.
DNA<span> is a long polymer with deoxyribose and phosphate backbone. Having four different nitrogenous bases: adenine, guanine, cytosine and thymine. </span>RNA<span> is a polymer with a ribose and phosphate backbone. Four different nitrogenous bases: adenine, guanine, cytosine, and uracil.</span><span />