Tina's heart began to beat much faster when it came to the scary scene in the movie. Which portion of the nervous system causes the heart to beat faster when afraid?
A. parasympathetic
B. sympathetic
C. somatic
D. axial
E. peripheral
Answer: B
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Males of many moth species have very large and elaborate antennae. These large antennae
A. enhance sensitivity for finding rotting food. B. enhance sensitivity for finding flowers in bloom. C. enhance sensitivity to sexual pheromones from females. D. enhance sensitivity to compounds emitted by other males that are important in sexual competition. E. serve an important aerodynamic function during flight.
The defining characteristic of a stem cell is
A) self-repair. B) self-renewal. C) the ability to turn into a cancer cell. D) its origin from a progenitor cell.
Which atmospheric component does NOT significantly affect global temperatures?
a. carbon dioxide b. methane c. oxygen d. ozone e. water
In a(n) (hypertonic/isotonic/hypotonic) solution, an animal cell can gain so much water that it may burst.
Fill in the blank(s) with the appropriate word(s).