Which of these body systems has cells that attach to each other to form a leak-proof barrier? Select one:

Reproductive system.

Respiratory system.

Urinary system.

Endocrine system.

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.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.