Overlapping fields of vision seen in mammals and some birds result in all of the following except:a
better ability to judge distance
b. better ability to distinguish colors
c. better depth perception
d. both retinas receiving visual information at the same time
e. binocular vision
B
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Which of the following statements is false?
a. HIV is the virus that causes AIDS. b. The AIDS virus is a retrovirus. c. The AIDS virus attacks macrophages, dendritic cells, and helper T cells. d. HIV has several target cells e. IgA antibodies can keep HIV levels low for decades.
Which term refers to the selectively permeable barrier that is present in the innermost layer of the root cortex?
a. pericycle b. root hairs c. endodermis d. quiescent centre
A flock of birds with various beak sizes migrates to a new island where their traditional food is not available
However, there are plants that produce a variety of large nuts, which can be eaten by birds with the largest beaks, and plants that produce a variety of small, soft seeds, which can be eaten by birds with the smallest beaks. Over time, this population divides into two species with large and small beaks. This is an example of A) directional selection. B) stabilizing selection. C) disruptive selection. D) sexual selection. E) genetic drift.
The initial encounter with an allergen is called the
A) Hypersensitivity dose B) Desensitizing dose C) Allergic dose D) Sensitizing dose E) Provocative dose