What effects have the historically low human population densities and the presence of several endemic diseases among humans in Africa had on the survival of African wildlife?

These factors hinder environmental protection efforts in eastern europe.

"water seeps into rock cracks and dissolved minerals there.the solution travels through cracks in the. eventually concentrating into large crystals." which process is that

Read the article titled "trans-saharan migration routes to north africa and the eu: historical roots and current trends." why do tens of thousands of sub-saharan africans try to cross the mediterranean each year? how are these refugees commonly portrayed? (site 1)