Which one of the following animals has no digestive tract of any sort? earthworm
ID: 180408 • Letter: W
Question
Which one of the following animals has no digestive tract of any sort? earthworm sea anemone tapeworm fluke. Which of the following is NOT a unique characteristic of chordates at some time in their life history? dorsal notochord a ventral hollow nerve chord pharyngeal pouches gill slits postanal tail The notochord is most closely associated with the nervous system spinal chord skeletal system skin system A and B only What is an evolutionary advantage of an exoskeleton? it protects the body it waterproofs the body?. it provides muscle attachment it allows an animal to molt A, B, and C only.Explanation / Answer
29. Answer is D.Tapeworm. It has no digestive tract and it absorbs nutrients directly from the host.
30. Answer is B. Ventral hollow nerve chord because it has only dorsal hollow nerve chord.
The unique characteristics of chordates are as follows,
1. Notochord 2. Dorsal hollow nerve chord 3. Pharyngeal Slits which in some chordates develop into gills 4. Post-anal tail.
31. Answer is C.Skeletal system. It supports the main part of the body and it is a flexible rod like structure.
32. Answer is E. It protects the body (A), it waterproofs the body (B) and it provides muscle attachment (C)
Exoskeleton cannot grow along with the animal so it is periodically shed through molting.
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