- what do we call an animal that produces both sperm and eggs
- the mouth is located at the end of a tube that can be extended called the
- only one opening into its body is the...
- platyhelminthes were the first animals to have...
- the flatworm's head encloses several....
- a coelom is usually formed when the _____ splits into two sheets of tissue that separate to form an internal cavity lined on both the ectodermal and endodermal side by mesodermal tissue
- some flatworms are freeliving, meaning they are....
- What essential element is needed for land snails to develop their shell?
- An important trend in animal evolution was cephalization, or development of a "head". An animal is said to show cephalization when it __________.
- Which tissue type or organ is correctly matched with its germ layer tissue?
- Each of the following statements describes characteristics of animals except for one. Which statement about animals is incorrect?
- Cooperation, Reciprocity, Altruism, Courtship, and Territoriality
- amniotic egg, rib ventilation, desiccation skin, and skeletal modifications
- Mockingbird and Curved-billed thrasher Family
- Ash-throated flycatcher and Western kingbird Family
- greatly enlarged pectoral fins that are fused to side of headabsence of anal finhaving gill slits on ventral surface of head
- presence of 5-7 gill slitsa polyphyodont dentition with multiple cohorts of replacement teeth located in gums simultaneously
- dermal bones supporting the gill membranesdermal bone supporting the operculumspecial type of mineralized enamel, forming a cap at the tip of each toothtypically a single dorsal fin
- lobe-finned fishes and tetrapods (amphibians, reptiles, birds and mammals)
- jawstypically 2 pairs of paired appendages (fins and limbs)three semi-circular canals in the inner ear