What does it mean when the compounds chemical formula if not include any numbers

What is an animal that lives by preying on other animals

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

How can an organ, such as the lungs, work for multiple body systems?