The difference between Invertebrates is that they have no spine and vertebrates are those who have a spine.
For the first one, it is invertebrates For the second one, it’s vertebrates For the third one, I think it’s vertebrates For the fourth one, invertebrates For the fifth one, vertebrates For the sixith one, it is vertebrates
The law of superposition states that rock strata (layers) farthest from the ground surface are the oldest (formed first) and rock strata (layers) closest to the ground surface are the youngest (formed most recently).