Male peacocks have tail feathers that make up about 60% of their body length. during the mating season they contract muscles to shake these feathers in front of females; females evaluate the feather rustling as part of selecting their mate. the is the mechanistic cause of this behavior; the is the adaptive function of this behavior.

the elements of art are the visual tools that the artist uses to create a composition. these are line, shape, color, value, form, texture, and space.

the principles of art and design are balance, contrast, emphasis, movement, pattern, rhythm, and unity/variety.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.