The six essential elements are shown in Image 2. Which two elements MUST be present for a molecule to be considered organic? *
oxygen and phosphorus
O hydrogen and nitrogen
O carbon and nitrogen
carbon and hydrogen
Other:

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

Which of the following is a testable hypotheses?

Which of these is not an example of molecular homology? 1. use of dna and rna as genetic material 2.use of glycolysis as the first step in cellular respiration in both plants and animals 3. the lack of an igf-1 gene in prokaryotes 4. the use of aldolase b to break down fructose in bacteria, plants and animals