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Describe the evolution of sense of smell from simple to our more complex noses

When water freezes, it . contracts expands

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction. this is an example of speciation.

What processes take place before the mature mrna exits the nucleus?