Which of the following statements is TRUE?
a. More than 96% of the animal kingdom is made up of invertebrates.
b. Invertebrates are unique because they are a monophyletic group.
c. Arthropods are the closest relatives of chordates.
d. Roughly half of the invertebrates are protostomes and the other half are deuterostomes.
e. Echinoderms are similar to vertebrates in that they are protostomes.
Ans: a. More than 96% of the animal kingdom is made up of invertebrates.
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