In 1952, Rosalind Franklin took an X-ray photograph that revealed the structure of DNA. James Watson and Francis Crick followed
up on this discovery in 1953. They discovered that the molecule has a specific shape that can best be described as — A. a single strand containing 4 different bases that vary depending on the type of DNA
B. ladder-shaped, containing 5 nitrogenous bases that bond to one another
C. triple-stranded, with bonds between each strand holding the three strands together
D. double-stranded and twisted, with bases bonded to other bases which hold the strands together
Rivers often start from the mountain streams and contain high amounts of oxygen. Rivers and streams grow larger as these waters merge. Rivers pick up sediments from the land as they flow. Lakes support many varieties of organisms, including plants in shallow,
