Dna evidence that is old or in poor condition can sometimes be salvaged and analyzed by using

pcr amplification
gel electrophoresis
dna from the mitochondria instead of the nucleus
rna

According to the big bang theory, after the "bang," the universe remained dark until about  300,000 yearsone billion yearsthree minutesthree billion years  later, when neutral atoms began to form.

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

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur