Which type of forces holds together complementary strands of dna?

The images show fossils of a modern bird and two extinct organisms (a tyrannosaurus rex and an archaeopteryx). based on the structure of the three organisms, it can be concluded that . the archaeopteryx and bird have wings, while dinosaurs have limbs. so, it can be concluded that .

What is the function of nucleic acids

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?