Which technology is shown in the photograph? A. Gel electrophoresis
B. Negative controls
C. Biostimulation reaction
D. polymerase chain reaction

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere, b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify, d)anaerobic bacteria kept thriving with more oxygen

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this

What is the difference between a scientific hypotheses and a scientific theory?