Rosalind franklin is famous for which contribution to the study of dna? a)creation of an accurate model of dna structure. b)creation of an x-ray diffraction image of dna structure. c)identification of a pattern in ratios of dna bases. d)identification of dna in bandages that contained pus.

When does a spring tide occur? question 9 options: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.