Gulls feed mostly by
a. capturing small fish.
b. eating algae.
c. probing for small prey in the mud.
d. scavenging.
e. dive bombing onto schools of fish
D
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A nonprofit conservation organization receives a sizeable donation and decides to purchase several thousand acres of "high desert" in southern California. This particular type of desert has an intermediate level of species diversity and few unique species. However, much of the original areas of high desert have been converted to suburban housing and shopping. The decision by the nonprofit to preserve this area was most likely based upon what conservation strategy?
A. Conservation of endemic species hotspots B. Conservation of megadiverse areas C. Conservation of representative habitats D. Conservation of single species
Which of the following cell types initiates a secondary immune response?
A) natural killer cells B) memory cells C) effector cells D) plasma cells
What did Darwin famously refer to as an "abominable mystery"?
a. the associations between specific types of flowers and specific animal pollinators b. the alternation of generations in plants c. the sudden appearance and immediate diversification of flowering plants in the fossil record d. the development of vascular plants
The components of the second line of defense against microbes may be characterized as
A) responders to invasion. B) passive barriers. C) mechanisms to strengthen the first line of defense. D) detecting the unique features of specific pathogens. E) both passive barriers and detecting specific pathogen features.