Use the drop-down menus to complete the sentences.

confirmed the three-dimensional structure of DNA.

first discovered DNA and named it “nuclein.”

first photo of DNA which helped scientists understand its structure.

studied DNA using special X-rays.

The earth's oceans are made up of chlorine, and trace elements. a) carbon, oxygen b) oxygen, silicon c) hydrogen, oxygen d) nitrogen, oxygen

Sequence how oxygen accumulated in the atmosphere and the effect it had on life by completing the flowchart

Australopithecus robustus was likely the longest-surviving species of australopithecine in south africa. it had: a. large molars, a big face, and a sagittal crest. b. a large body, large teeth, and a sagittal crest. c. a big brain, big teeth, and a big face. d. a big face, large teeth, and a large body