Question

!!! One Medal Question !!!

Answer 1

Invertebrates are animals without backbones mostly found in spineless creatures. Sponge is an example of invertebrates, they don’t have bones (no backbones either). You’ll see other invertebrates with some basic skeletal tissues. The nervous system of these type of animals that allows them to sense and touch is the brain primarily, the mouth, nerve net, and tentacles.

Answer 2

- Describe evidence showing that echinoderms are more closely related to chordates than are other invertebrate phyla.
well, echinoderms are deuterostomes and they are vertebrates because during the embryo of the central cavity, it becomes the anus wheareas invertebrates have their embryo central cavity is the mouth.

Answer 3

for the 2nd q
https://www.boundless.com/biology/invertebrates/superphylum-deuterostomia/phylum-echinodermata/

Answer 4

Thank you ! @Zale101