Which statement best explains why obsidian has a smooth glassy surface but basalt has a rough surface

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.

In what layer of the sun is energy transfers between atoms

How does an angiosperm prevent self pollination