What can you say about the ancestors of modern echinoderms that you can't say about other animals? Question 3Select one: A. They lived in the early Palaeozoic instead of the Neozoic B. Most were asymmetrical instead of either bilateral or pentaradial C. They were skeletonised and somewhat diverse D. They were sessile, benthic filter feeders
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Zoologists who study the species and evolution of the phylum Echinodermata generally agree about what the echinoderm ancestors probably looked like and also speculate regarding some of the 'modern' adaptations. Classify these characteristics as ancient or modern to describe the evolution of this phylum. Tube feet for movement Ancient Modern Predatory Tube feet for feeding Crinoid-like Mouth-up orientation Mouth-down orientation
Sri K.
Which of the following is not true of the Ediacaran fauna? a. Their delicate exoskeletons left a good fossil record of their diversity. b. They were multicellular. c. They were mostly extinct in the early Cambrian Period. d. They had bilateral symmetry.
Echinoderms all share a five-part radial symmetry; it's one of their shared derived characters. Sea cucumbers are strange, though. Internally they are still radially symmetric, but superficially they look bilaterally symmetric. Using your knowledge of body symmetry, what does this suggest about how the lifestyle of sea cucumbers differs from other echinoderms? Select one: a. Other echinoderms are motile while sea cucumbers have adapted to a sedentary lifestyle b. Sea cucumbers are grazers while other echinoderms are carnivorous c. Sea cucumbers are carnivorous while other echinoderms are herbivorous d. Other echinoderms are sedentary while sea cucumbers are motile
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