Mummification is a process in which the skin and flesh of a corpse can be preserved. The process can occur either naturally, or it can be intentional. They did this so their bodies were preserved and they could relax while they go to the gods.
A rigid class system is a manner of social organization in which, at birth, an individual already pertains to a certain group and social mobility is almost non-existent along lifetime.
A society which follows this model would prevent immigration. Newcomers usually pertain to the lower social classes, and if they know in advance that they will have no possibilities of improvement, they would probably choose a different destination. In the end, the most damaged ones by such a system are the national individuals who pertain to the lower social classes, as the structures that function in their country foster inequality and prevent them from improving their situation and living conditions.
Answer:
Saharan, Sahelian, wet tropical and equatorial climate
Explanation:
He basically believed in evolution,
he said that in species, a mutation occured,
sometimes this meant they were better adapted to survive,
therefore they would survive,
the others would die out,
the mutated animal/plant would reproduce,
they would pass on their gene to their offspring,
this is his theory of evolution :)