Which term is used to describe a fact that has always been observed true but could at some future time not be observed as true. A Hypothesis OB. Theory Oc. Law

What initially causes a nerve impulse? release of enzymes out of the neuron movement of chemicals into the dendrites of the neuron pathogens attacking the dendrites of the neuron red blood cells bathing the neuron

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

Examine the following diagram. place the labeled layers in order from youngest to oldest.