Identify a and b in the following pie chart.

a-  insects , b- mollusca a- ferns , b - mollusca. a- mollusca , b- insects. a- insects , b - ferns.

a-  insects , b- mollusca

Mollusca : large phylum  of invertebrate animals (such as snails, clams, or squids) with a soft unsegmented body, usually enclosed in a calcareous shell broadly.  Insects : any member of the largest class of the phylum Arthropoda, which is itself the largest of the animal phyllum. Insects have segmented bodies, jointed legs, and external skeletons (exoskeletons).