An opening between the right and left atria that's present in fetal mammals is the a. ductus arteriosus. b. foramen ovale. c. umbilical fistula. d. portosystemic shunt.

Where does the information about where each transcription factor binds originate?

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.

Many organizations release indexes used to measure the development of the world's countries. as we learned in this lesson, these indexes measure many factors, from life expectancy to happiness. in your opinion, what are the three most important factors we can use to determine how developed a country might be? explain your answers in a few sentences.