The heart of an embryo starts to pump blood by the .

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.

Which identifies the main purpose of biological taxonomy?

Hybrid instruments that play sounds that are part sampled and part synthesized are known as: