Select all that apply.
which animals are invertebrates?
starfish
earthworms
tunicates
amphibians
lancelets
octopus
crab
grasshopper

The correct answer is- starfish, earthworms, tunicates, lancelets, octopus, crab, grasshopper.

Invertebrates are those living organisms that don’t possess a vertebral column. The backbone is another name for the vertebral column. More than 90% of the species that are present on earth are invertebrates. There are primarily 8 phyla that come under invertebrates.

Out of the given options, the invertebrates are-

starfish ( come under phylum echinodermata), earthworms ( phylum annelida), tunicates and lancelets ( marine invertebrates that are related to chordates), octopus ( phylum mollusca), crab and grasshopper ( phylum arthropoda),

a polymer is a chainlike molecule made up of small molecular units. these small molecular units are called monomers. monomers of polymer can be joined together either naturally or synthetically.  

the answer is b)3/8x+1