The hair cells of the inner ear begin to suffer damage when exposed to sounds louder than
a. 35?45 decibels.
b. 45?55 decibels.
c. 55?65 decibels.
d. 65?75 decibels.
e. 75?85 decibels.
E
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Which of the following statements about plant embryo development is correct?
A. The suspensor forms from the shoot apical meristem before development of the root apical meristem. B. The development of the shoot and root apical meristems is controlled independently. C. The plant hormone abscisic acid is important in the development of the shoot-root axis. D. The protoderm establishes the procambium tissue in the young plant embryo.
How many pairs of autosomes are in a typical human karyotype?
a. 8 b. 22 c. 23 d. 46 e. 92
One adaptation to flight in birds is lighter bones, which lack
A. medullary cavities. B. collagen. C. the periosteum. D. bone marrow. E. calcium.
A new treatment for burns involves using skin biopsies to generate ____________________, which are sprayed onto
the burned area and form a new layer of skin. Fill in the blank(s) with the appropriate word(s).