Answer:
1st blank (box) answer: "backbone or spinal column"
2nd blank (box) answer:"lacks a vertebral column or backbone"
Vertebrates are animals that have a backbone or spinal column, also called vertebrae. These animals include fish, birds, mammals, amphibians, and reptiles. How are they classified? Vertebrates are classified by the chordate subphylum vertebrata.(fishes, amphibians, reptiles, birds, and mammals.)
Invertebrate, any animal that lacks a vertebral column, or backbone, in contrast to the cartilaginous or bony vertebrates. Worldwide in distribution, they include animals as diverse as sea stars, sea urchins, earthworms, sponges, jellyfish, lobsters, crabs, insects, spiders, snails, clams, and squid
Explanation:
HOPE IT HELPS>,<
