Do all minerals have the same type of crystal structure because all of their atoms are arranged the same way?

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

The creation of the european union has had all of the following effects except

In the scramble for africa, european powers drew boundaries and created states that benefitted the colonizers while ignoring the needs of the local populations. what effects did this policy have on the indigenous people following independence?