Choose the best answer. What is one difference between arthropods and echinoderms?

A) Arthropods have exoskeletons, but echinoderms have endoskeletons.
B) Arthropods have jointed legs, but echinoderms have straight legs.
C) Echinoderms have spiny skin, but arthropods have soft bodies.
D) Arthropods have body segments, but echinoderms only have a skeleton

How do water’s relative densities as a solid and a liquid differ from that of most other substances? water’s solid and liquid forms have different densities, while most other substances have solid and liquid forms with similar densities. water’s solid and liquid forms have similar densities, while most other substances have solid and liquid forms with different densities. water’s liquid form is less dense than its solid form, while the opposite is true of most other substances. water’s solid form is less dense than its liquid form, while the opposite is true of most other substances.