Answer:
There are over 30 phyla dedicated to invertebrates. Major invertebrate phyla that you should know include porifera, cnidaria, platyhelminthes, nematoda, mollusca, annelida, arthropoda, and echinodermata
Explanation:
Insertion
Chromosome 4 is <em>inserting </em>a piece of itself into chromosome 20
bilateral
the answer would be d. tt