Which process establishes the primary germ layers.
Answer: Gastrulation
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Animal Behavior
- Most of the exchange surfaces of multicellular animals are lined with
- The absorptive epithelia in the gut are considered "polarized" because
- Of the following choices, the epithelium with the shortest diffusion distance is
- An exchange surface in direct contact with the external environment is found in the
- Tissues are composed of cells, and tissues functioning together make up
- Multicellular organisms must keep their cells awash in an "internal pond" because
- Interstitial fluid is
- The specialized function shared by the cells that line the lungs and those that line the lumen of the gut is that both types of cells
- To increase the effectiveness of exchange surfaces lining the lungs and the intestines, evolutionary pressures have
- As body size increases in animals,
- All animals, whether large or small, have
- The specialized structures of complex animals have evolved because
- The similar fusiform body shape of diverse animals, such as sharks, penguins, and aquatic mammals, has evolved because
- Evolutionary adaptations that help diverse animals directly exchange matter between cells and the environment include
- Penguins, seals, and tuna have body forms that permit rapid swimming, because
- Which choice best describes a reasonable mechanism for animal structures becoming better suited over evolutionary time to specific functions?
- If thermoregulation is considered to be a secondary function of the large ears of jackrabbits, then the primary function of the ears is
- When the temperature of the outside air exceeds their internal body temperature, jackrabbits living in hot, arid lands will
- Which of the following characteristics indicates that mollusks are more closely related to arthropods than to chordates?
- Many parasitic flatworms have an intermediate host. This indicates that the
- Members of which of the following animal groups were among the first to inhabit land and were ancestors of the reptiles?
- In animals, all of the following are associated with embryonic development EXCEPT
- All of the following are deuterostomes EXCEPT
- In a mammalian embryo, the somites give rise to
- If an invertebrate possesses nephridia as an excretory system, skin as a gas exchange system, and a closed circulatory system, the animal is most likely to be