Darwin’s emotional principle of direct action of the excited nervous system on the body suggests that unused excitement in the body might be expelled by:

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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.

How do diseases caused by bacteria and diseases caused by viruses react to antibiotics?