Question

What is an animal that is classified as an invertebrate?
a. flounder
b. fish
c. shark
d. sponge

Answer 1

InvertebratesEchinoderms Sponges - Animals without backbone for 
Worms Mollusks support tends.
Arthropods Cnidarians - Can be found anywhere and some 
live in other organisms.
- Diverse group of animals.
- Exoskeleton- outside of body

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Answer 2

D. A sponge is an invertebrate.