Which of the following is the correct pairing of rickettsial pathogen and vector?
A. R. rickettsia; flea
B. R. typhi; tick
C. R. prowazekii; louse
D. R. typhi; mite
E. R. rickettsia; louse
Answer: C
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Pseudofeces are:
a. semisolid deposits containing un-digested material. b. semisolid deposits of digested material. c. solid deposits containing un-digested material. d. solid deposits containing digested material.
How do primary and secondary growth differ? In primary growth, plants _______________. In secondary growth, stems and roots ______________ and become woody
Fill in the blank(s) with correct word
Scientists use various terms to describe conclusions reached through the scientific method. Which of the following terms conveys the least degree of certainty?
A) theory B) hypothesis C) law D) both hypothesis and theory E) both theory and law
Polydactyly is a dominant trait. What symbol on a pedigree chart would represent a male who has polydactyly?
A) a half-shaded square B) a shaded square C) a half-shaded circle D) a clear circle