When a dam is built in a hot, dry area, creating a lake or reservoir aboved the dam, how does the evaporation from that reservoir affect the environment ?

According to the earth science reference tables, during which geologic time period were the continents of north america, south america, and africa closest together?

What is the amount of organic matter in all living organisms in a habitat called?

Quiero una redaccion de yo soy medico y que tenga 10 lineas