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A characteristic that is shared by snakes and birds is ______. |
the amniotic egg |
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A true coelom is ______. |
completely lined with tissue derived from mesoderm |
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All chordates have ______. |
a dorsal, hollow nerve cord and notochord |
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Almost every element of bird anatomy is modified for what? |
enhancement of flight |
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Among vertebrates, the unique feature of lampreys and hagfish is the ______. |
absence of jaws |
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Features unique to mammals include ______. |
the presence of hair |
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Flatworms are similar to cnidarians in that both ______. |
have true tissues |
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How do sponges differ from all other animals? |
sponges lack true tissues |
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Humans are chordates. Which animal group is most closely related to chordates? |
echinoderms |
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Rays are a type of ______. |
cartilaginous fish |
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The common ancestor of all animals is likely to have been a(n) ______. |
colonial, flagellated protist |
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The lancelet is a(n) _____. |
chordate |
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Unique features of vertebrates include the presence of a(n) ______. |
skull and backbone |
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What distinguishes animals from other eukaryotes? |
they ingest food |
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What does the term tetrapod mean? |
having four feet |
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What name is given to the food-trapping cells of sponges? |
choanocytes |
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Which of the following is a characteristic of all chordates? |
they all have a notochord sometime during the life cycle |
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Which of these exhibits radial symmetry? |
Ferris wheel |
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______ are the mammalian group that lay eggs. |
monotremes |
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______ are the most diverse group of arthropods. |
insects |
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