_______ is/are the raw material of evolutionary change
Fill in the blank(s) with the appropriate word(s).
Ans: mutations
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Chemical energy is the energy of which of the following?
a. the bonds that hold food together b. motion of a sprinter c. heat from a fireplace d. electricity used to run a blender
A country's ecological footprint can be calculated by multiplying its population size by the footprint of each individual. Why are some ecologists concerned about the ecological footprint of a country like India
A. Its population is increasing. B. Its standard of living and land area are increasing. C. Its population and land area are increasing. D. Its standard of living is increasing. E. Both its population and standard of living are increasing.
Which of the following statements concerning glial cells is true?
a. Astrocytes are phagocytic cells that remove debris in the central nervous system. b. Schwann cells form sheaths around neurons within the central nervous system. c. Oligodendrocytes regulate the concentration of neurotransmitters in neurons. d. Microglia are involved in the neurological disease multiple sclerosis. e. Ependymal cells help produce and circulate cerebrospinal fluid.
What is incorrect about pertussis?
A. a virulence factor of B. pertussis is toxins that destroy cilia cells B. the source of infection is direct contact with inhaled droplets C. the paroxysmal stage is characterized by persistent coughing D. the number of cases is steadily decreasing since 1976 E. it can cause severe, life-threatening complications in babies