[Campbell Biology P.736] Based on the provided text and images, which of the following state... | Practice Question
Based on the provided text and images, which of the following statements is accurate?
A: Placozoans, at 0.5 mm, are significantly larger than Acoela, which are 1.5 mm in length.
B: Syndermata includes microscopic rotifers that possess complex organ systems, a feature not found in phyla like Porifera.
C: Ctenophores use specialized sticky threads to propel themselves through water, and their body plan is biradially symmetrical.
D: All phyla discussed, except Porifera, have a central nervous system for processing information.
Explanation
The text states that Syndermata includes 'rotifers, microscopic animals with complex organ systems'. In contrast, Porifera 'lack tissues' and therefore do not have complex organ systems. Option B accurately captures this distinction.