Which of the following bonds holds together a protein’s primary structure? a. Hydrogen bonds
b. Dipole-dipole interactions
c. Ionic bonds
d. Covalent bonds

Explain how fossils scientists make discoveries about the lives of organisms and about how environments have changed over time. plz hurry up it time

When analyzing tree rings, what do scientists assume a thin ring indicates?

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.