Plasmodium falciparum is a protistan parasite, borne by mosquitoes, that constitutes a serious health problem for humans. The disease it causes is:
A. Lyme disease
B. malaria
C. diabetes
D. yellow fever
E. dengue fever
Answer: B
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Why do many animals do most of their calling at dawn and dusk?
A. Imprinting behaviors are better received at those time. B. Animals preferentially mate at night. C. Air is less turbulent and carries sound better. D. Most predators are not active at those time. E. Pheromones are released at dawn and dusk.
Complete the analogy: ________ are to plant evolution as ________ is/are to vertebrate evolution
A) Ferns; insects B) Mosses; Tiktaalik C) Angiosperms; fungi D) Fungi; birds
In order to be considered infertile, how long must a couple go without achieving pregnancy despite regular unprotected intercourse?
A. 30 days B. 3 years C. 1 year D. 6 months E. 12 weeks
Kinetic energy differs from chemical energy in that
A) kinetic energy is stored energy that has the potential to do work, and chemical energy is the energy of movement. B) kinetic energy can be converted into various forms of energy, whereas chemical energy can only be converted into heat. C) kinetic energy is the energy of a moving object, whereas chemical energy is the potential energy of molecules. D) chemical energy is a particular form of kinetic energy.