Platelets are formed by:
a. cells division in the spleen.
b. disruption of a phagocyte.
c. fragmentation of the cytoplasm of a B lymphocyte.
d. small pieces pinching from very large cells in the bone marrow.
e. the release of granules from a neutrophil.
d
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Keystone predators can maintain species diversity in a community if they _____
A) competitively exclude other predators B) prey on the community's dominant species C) allow immigration of other predators D) reduce the number of disruptions in the community E) prey only on the least abundant species in the community
When imbalances occur in the sex ratio of sexual species that have two sexes (that is, other than a 50:50 ratio), the members of the minority sex often receive a greater proportion of care and resources from parents than do the offspring of the majority
sex. This is most clearly an example of _____. A) sexual selection B) disruptive selection C) balancing selection D) stabilizing selection E) frequency-dependent selection
Using a hand puppet to feed a baby condor is done to promote on condors and prevent to humans.
A. habituation; operant conditioning B. imprinting; operant conditioning C. imprinting; habituation D. habituation; imprinting E. operant conditioning; imprinting
Gases move independently down their pressure gradients, from higher to lower pressure
a. true b. false