What is considered the most structurally complex animal phylum?
a. Chordata
b. Echinodermata
c. Mollusca
d. Arthropoda
e. Annelida
Question 2Which crustacean is known for grazing on diatoms and dinoflagellates and is among the most abundant multicellular
animals on the planet?
a. krill
b. barnacles
c. amphipods
d. water fleas
e. copepods