【简答题】There are two types of twins; identical and non-identical twins. Identical twins are formed from a single egg in mother’s body which divides to from two separate babies. Identical twins look the same,...
【单选题】Crying and waking up in the middle of night are routine during any newborns first few months. But if those crying episodes continue on a regular【C1】______past the first year, then they may signal poss...