Which memory system is preserved the longest, even into alzheimer's disease?

Iwanna go do something with my ideas? ?

The earths core is made up mainly of what 2 substances? 2. like an egg, earth has a core, a layer surrounding the core, and a thin, hard outer layer. which layers of the earth match the layers of an egg?

When a population split into two subgroups what is most likely to cause the subgroups to develop different traits?