The organ of Corti ____.
A. is integral to balance
B. controls the sense of depth perception
C. has hair cells that fire and sends signals to the brain
D. is involved in visual acuity
E. detects light energy
Answer: C
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Which statement about diversity in eye development is not correct?
A. Planaria have the simplest eyes, which are basically pit-shaped cells containing photoreceptors. B. Evolution of the spherical lens improved images as animals evolved. C. Both squids and vertebrates have singlelens eyes, but they are very different in their development, anatomy, and physiology. D. The percentage of living animals possessing true eyes that can produce an image is small. E. Compound eyes consist of hundreds of small lenses arranged on a convex surface.
Tissues present during development of an organ but not found in the fully formed organ are removed
by
a. apoptosis only. b. programed cell death only. c. molecular signals received by receptors on marked cells only. d. apoptosis and programed cell death. e. apoptosis, programed cell death, molecular signals received by receptors on marked cells.
Type II survivorship curves
a. are characteristics of humans and elephants. b. typify a population in which all ages have an equal chance of survival. c. indicate a high mortality rate in the very young. d. show that very few young are produced, that each is given parental support, and that most individuals live a relatively long life and die of old age. e. are typical of annual plants.
A hominin of Europe and Asia that became
extinct nearly 30,000 years ago was a. a dryopith. b. Australopithecus. c. Homo erectus. d. Homo neanderthalensis e. Homo floresiensis.