In maintaining the large land empire of russia, what was arguably the main difficulty?

a. ethnic divisions
b. inexperienced leaders
c. lack of industrialization
d. lack of natural resources

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

Dna replication or repair occurs in a cell in all of thw following situations except when

Can a trait be both polygenic and have multiple alleles? explain why or why not.