Explanation:
Russian-American biochemist Phoebus Levene (1869-1940), who had discovered ribose sugar in 1909 and deoxyribose sugar in 1929, suggested the structure of nucleic acid as a repeating tetramer. He called the phosphate - sugar - base unit a nucleotide.
Answer:
Explanado yo have a picture
Study it under a microscope!
Any organisms in the pond water are more than likely very, very small! Microscopic, even;)
