By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. There are gaps in the fossil record because many early forms of life were soft-bodied, which means that they have left few traces behind. This is why scientists cannot be certain about how life began.
Minimal medium containing streptomycin media would be use for this selection of the strain because majority of these will appeared on selective minimal medium plates with streptomycin
During meiosis 1, anaphase, the homologous chromosomes separate towards the opposite poles,line up in a random order and in crossing over, create genetic diversity.
