Arrange the steps of an allergic response in the proper order
1. Allergic symptoms appear.
2. Allergen binds with IgE.
3. IgE combines with mast cell receptors.
4. Mast cells release histamine.
5. Plasma cells sensitized.
a. 5, 3, 2, 4, 1
b. 1, 5, 2, 4, 3
c. 5, 2, 4, 3, 1
d. 1, 4, 5, 2, 3
e. 4, 5, 2, 3, 1
ANSWER: e
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According to the intermediate disturbance
hypothesis, a. species richness becomes greatest in between disturbances of moderate intensity or frequency. b. a disturbance is necessary during succession in order to stabilize the community. c. community succession is highly predictable. d. competition and other species interactions are the most important factors in shaping community structure. e. a community reverts to a climax state after a disturbance.
Pelvic bones in snakes and whales are ________ structures
Fill in the blank(s) with correct word
In humans and some other vertebrates, the organ that collects sound and directs them to the auditory canal is called the ____.
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