If organ systems are present in an animal, what else must be present

Organs, tissues, cells,

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.

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully