Polar bears are classified as a threatened species because
a. they have reduced hunting success.
b. they have reduced reproductive success.
c. their habitat is decreasing in size.
d. all of these
D
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The diagram below shows inbreeding between _________ which, over time, could lower the fitness of the population. This lowering of fitness because of inbreeding is called _________.
A. siblings; inbreeding depression
B. cousins; inbreeding depression
C. siblings; genetic drift
D. cousins; genetic drift
E. siblings; sexual selection
During inspiration (a.k.a. inhalation) of air into the lung of a mammal
A. the intercostal muscles relax. B. the chest cavity has a positive pressure. C. the diaphragm contracts. D. the diaphragm moves upward. E. the rib cage moves down.
The _______ nerve carries signals from the retina to the visual cortex of the cerebrum.
Fill in the blank(s) with correct word
Explain how dissolved sugar is transported in the phloem by means of a pressure gradient. What will be an ideal response?