The building blocks of DNA are like alphabet letters, because they: A. Are each associated with a particular sound
B. Can be used in a variety of languages
C. Each have an uppercase and a lowercase form
D. Spell out different instructions depending on their order

One important development during the 3rd trimester that will insulate the infant against changes in temperature is a. the deposition of fat under the skin b. the closing of the septum between c. the atria of the heart d. the beginnings of lung functioning e. the beginnings of light and sound sensing