Under what circumstances can twins be born in humans?

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.

How can an organ, such as the lungs, work for multiple body systems?

Awolf pack hunts,kills, and feeds on a moose. in this interactions, the moose is a?