What is the difference between a vertebrate and invertebrate?

a vertebrate is an organism with a spinal cord, an invertebrate has no spinal cord

Vertebrates are animals that have a backbone inside their body. The major groups include fish, amphibians, reptiles, birds and mammals. Invertebrates don't have a backbone. They either have a soft body, like worms and jellyfish, or a hard outer casing covering their body, like spiders and crabs.

Explanation:

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it