All of the following are examples of learning except
A. a wolf pack establishing a territory.
B. a spider building a new web after the original was destroyed.
C. ducklings following their mother.
D. animals in zoos begging for food.
B. a spider building a new web after the original was destroyed.
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Which of the following statements about muscles is correct?
A. Smooth muscles contract more slowly than skeletal muscles. B. Actin and myosin are arranged irregularly in cardiac and smooth muscles. C. Skeletal muscles are striated, whereas cardiac muscles are not. D. Striated muscles use actin and myosin to generate force, whereas smooth muscles do not. E. Cardiac muscles are found in the heart and the walls of the arteries.
__________ are small gaps across a leaf’s epidermis
that help regulate water and gas levels in the plant. a. Palisade cells b. Mesophyll c. Roots d. Stomata e. All of these
The life cycle in Figure 27-3 could represent:
a. a moss.
b. a whisk fern.
c. a club moss
d. a horsetail.
e. a liverwort.
Imagine an invertebrate that lives in an estuary where salinity varies cyclically with the tides. If this animal practices homeostasis with respect to the salt concentration of its body fluids, its salt concentration will show ________
A) no fluctuations B) slight, continuous fluctuations C) a more concentrated state than the surrounding water at all times D a more diluted state than the surrounding water at all times