Darwin realized that for a species to survive, its members must surive and

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.

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

How does the nervous system affect the excretory system?