Which mechanism of succession describes the model where grasses and weeds help create conditions where mixed-herbaceous plants grow - then the mixed-herbaceous plants create conditions where shrubs grown - and so on, until the climax forest is reached

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