When Robert and John MacArthur investigated the determinants of species diversity for birds, they developed an index of foliage height diversity as a predictive variable. In so doing, which of the following determinants of diversity did they identify as important?
A) productivity
B) structural complexity
C) climate
D) latitude
Ans: B) structural complexity
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The hypothesis that says, "as one species changes so will the other," is called the ________
a. Law of Independent Assortment b. Red Queen hypothesis c. Law of Thermodynamics d. Principle of Genetics e. Evolutionary Divergence
The dermal endoskeleton of echinoderms is made of
a. cartilage. b. bone. c. calcium carbonate. d. chitin.
During sexual intercourse
a. the female's labia swells with blood. b. pelvic thrusting stimulate mechanoreceptors. c. inward flow of blood exceeds outward flow in the penis and it becomes erect. d. heart and breathing increase in both sexes. e. all of these occur.
Which of the following ions is significantly involved in the opening and closing of the stomata?
(A) Calcium (B) Nitrogen (C) Potassium (D) Magnesium