Kingdom Animalia Ch. 12- Phylum Mollusca. Key Characteristics of Mollusks 2 nd largest animal phylum Marine, freshwater, and terrestrial Seven classes.
1 Classification copyright cmassengale. 2 There are 13 billion known species of organisms There are 13 billion known species of organisms This is only_______of.
INVERTEBRATES Mollusca, Annelida, Arthropoda, Echinodermata Animals that lack vertebrae (classed by a characteristic they don’t have.) 97% of all species.
