Explain why smallpox vaccination is still being considered and debated, even though smallpox has been eradicated
What will be an ideal response?
When smallpox was eradicated in 1980, smallpox vaccination was globally phased out primarily because of adverse effects experienced by some vaccinated individuals. However, in recent years there have been calls for the resumption of smallpox vaccination for two primary reasons. First, stocks of smallpox virus still exist in laboratories in the United States and Russia, and may also be held by or available to unauthorized organizations around the world. The accidental or purposeful release of this virus would be devastating to much of the population, which is no longer, or never was, immune to smallpox. Second, in recent years there has been an increase in the number of monkeypox cases around the world. Due to similarities between the two viruses, vaccination against smallpox also protects against monkeypox, and it is thought that resumption of smallpox vaccination might be a good way to eliminate the current monkeypox epidemics.
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In the embryonic development of flowering plants, the basal cell develops into the:a
apical cell. b. apical meristem. c. suspensor. d. integuments. e. endosperm.
The Carboniferous Period is extremely significant to our current society because
A. mammals diversified. B. human evolution began in the period. C. plants and animals first adapted to a terrestrial environment during this period. D. the Carboniferous forests turned into the coal that fuels modern society.
Which of the following definitions is INCORRECT?
A) endemic: a disease that is constantly present in a population B) epidemic: a disease that is endemic across the world C) pandemic: a disease that affects a large number of people in the world in a short time D) sporadic: a disease that affects a population occasionally E) incidence: number of new cases of a disease
All trees belonging to species A have started to die mysteriously if left untreated. Affected trees that are treated with a fungicide recover. Also, trees in parks that have been treated with broad-spectrum insecticides will not get sick
Which of the following is the most parsimonious explanation for the dying of trees belonging to species A? a. The trees are killed by the feeding activity of insects alone. b. The disease is vectored by insects. c. All trees are killed by a wind-borne fungal disease. d. Some trees are killed by fungal infections while others are killed by insect feeding. e. A and B are equally parsimonious.