A change in the eccentricity of Earth's orbit towards its maximum will increase or decrease the solar input that the Earth receives?

The cluster of developing cells from conception until birth is called an

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.

Why are common names a problem for scientist?