En términos de la organización social, ¿qué característica tenían en común las primeras civilizaciones?

The point where two air masses meet is called a

During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic

Altocumulus, altostratus, cirrocumuls, cirrostratus, cirrus, cumulonimbus, cumulus, nimbostratus, stratocumulus, stratus 8.) clouds with tallest vertical development 9.) low altitude clouds in solid layers that produce rain 10.) high altitude thin flat layers of clouds 11.) rain clouds that form under stable atmospheric conditions 12.) middle altitude clouds with globular appearance