Tree bark is . made of living xylem cells
a layer of dead dermal tissue
made of flexible collenchyma cells
only found in older plants

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. this is an example of speciation.

Body systems are not completely independent they integrate and work together describe one example of the integration between body systems

Cells destroy body cells infected by a virus or bacteria.