Eating a pop tart gives you
a. chemical energyb. nuclear energyc. light energy

The image shows embryos of three vertebrate classes

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

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