Which statement best sums up our understanding of how animals navigate during migration?
A. The mechanisms have been worked out in great detail, from the genes involved, to the brain structures, to the resulting behavior.
B. We have a thorough understanding of orientation but not navigation.
C. We have some understanding of the information different animals rely on (sun, stars, or magnetic fields), and some sensory structures, but beyond that the mechanisms are still mysterious.
D. Animal navigation is a complete mystery.
C. We have some understanding of the information different animals rely on (sun, stars, or magnetic fields), and some sensory structures, but beyond that the mechanisms are still mysterious.
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Describe an amniotic egg. What is its evolutionary significance?
What will be an ideal response?
__________ or __________ extend from many prokaryotic cells and serve in attachment and motility
ANSWER: Pili; flagella Fill in the blank(s) with the appropriate word(s).
If you were a very thirsty cell, which process would you use to take in some nutrients secreted by one of your neighbors?
A. Phagocytosis B. Pinocytosis C. Receptor-mediated endocytosis D. Exocytosis
Which one of the following is the external structure of the ear that enhances reception of sound waves?
A. tympanic membrane B. oval window C. cochlea D. pinna