Which feature do all adult echinoderms have?

moveable spine
muscular foot
mantle
endoskeleton

the statement is true

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

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.