What structure of protein is the second folding of the protein chain

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.

If a keystone species is removed from an ecosystem

The means by which a cell transports large molecules out of the cell is called