The research aims to produce valid information and must use reliable instruments that guarantee accurate and make it quantifiable and possible reproducibility. Allowing the exclusion or at least control prejudice of personal insights and trends that may distort the results.
martes, 15 de febrero de 2011
An artist's depiction shows lystrosaurs foraging near a stream. Flat-faced with a beak and two teeth that resembled tusks, lystrosaurs were synapsids, animals that arose in the Permian and eventually gave rise to mammals.