Which of the following is a fire-maintained climax that gives way to oak woodland when fire is suppressed?
A) arctic tundra
B) chaparral in California
C) sugar maple-basswood forest in Wisconsin
D) oak-hickory forest in the Piedmont of North Carolina
Ans: B) chaparral in California
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When a forest fire destroys a habitat, but secondary succession allows the forest to be rebuilt, the new forest will continue to be modified over the years until equilibrium is reached and what has formed?
a. population b. primary community c. climax community d. ecosystem
Answer the following statements true (T) or false (F)
1.A fever has no defense function, but only acts as a sign that an infection is present in the body. 2.Lymphatic capillaries help to recycle the contents of blood plasma, thus helping maintain homeostasis in the circulatory system 3.The primary immune response produces memory cells that stimulate a faster immune response on a subsequent exposure to the same foreign antigen. 4.Secondary immune responses, to diseases, depend on and follow primary immune responses. 5.Human development is an example of direct development.
The study of comparative embryology reveals the
conservative nature of the genes responsible for a. food procurement. b. reproductive behavior. c. embryonic development. d. size. e. intelligence.
Select the statement that is TRUE during expiration?
a. Transpulmonary pressure (Ptp)= 0 b. Alveoli pressure (Palv)? atmospheric pressure (Patm)= 0, and Palv = Patm c. Palv is greater than Patm, Palv ? Patm is positive and airflow is outward d. Intrapleural pressure (Pip) becomes more negative