Evidence for population decline beginning around the 6th century lends some support to the internal unrest hypothesis. The decline of Teotihuacan has been correlated to lengthy droughts related to the climate changes of 535–536. This theory of ecological decline is supported by archeological remains that show a rise in the percentage of juvenile skeletons with evidence of malnutrition during the 6th century, which is why there is different evidence that helps indicate that famine is most likely one of the more possible reasons for the decline of Teotihuacan. The majority of their food came from agriculture: They grew things such as maize, beans, amaranth, green tomatoes (tomatillos?), and pumpkins, but their harvest was not nearly sufficient to feed a population as big as it is believed have lived in Teotihuacan. This finding does not conflict with either of the above theories, since both increased warfare and internal unrest can also be effects of a general period of drought and famine. Other nearby centers, such as Cholula, Xochicalco, and Cacaxtla, competed to fill the power void left by Teotihuacan's decline. They may have aligned themselves against Teotihuacan to reduce its influence and power. The art and architecture at these sites emulate Teotihuacan forms, but also demonstrate an eclectic mix of motifs and iconography from other parts of Mesoamerica, particularly the Maya region.