Undifferentiated cells eventually specialize into different types of cells, which make up different tissues. Those tissues later develop into organs.
The evolutionary significance is that coal does not change the properties of the plant from that time even though the plant might have evolved from that time. That's why you can study coal to find out how the type of plant was at that time period and how it has evolved until now.
It is a hypothetical neuron that can be shown to represent a specific psychological concept. this cell becomes active every time someone thinks about a complex thing.
If it is continental or oceanic,and the temperature of the outer core and how valcanically active the region is.
i am 90% sure
