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Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism

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

Which structure in the cardiovascular system connect arteries to veins?