Single ring nitrogen containing base

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.

Are gametes exactly the same? explain why or why not?

Some substances but not other can cross the (blank) membrane of a cell