Describe how the structure of the sargassum it to float on water

Which are forms of nitrogen that are usable by humans

Any sound above what db can cause hearing loss in human beings

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.