Whats so important about the nitrogen and hydrogen in the amino acids?

Pixels are often referred to using dpi, or dots per inch. true\false

Consider this plant cell which organelle is labeled g

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.