Heartbeat, digestion, and other self-regulating bodily functions are governed by the

answer; ///as energy flows through an ecosystem,energy (decreases) at each

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

the answer is d.) homologous; have mammary glands

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.