In early 2014, West African countries began diagnosing and reporting cases of Ebola for the first time in their history. This is an example of a(n) (endemic/epidemic/sporadic) disease.
Fill in the blank(s) with the appropriate word(s).
epidemic
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Sulfur has six valence electrons. How many covalent bonds does a sulfur atom typically form?
A. 3 B. 1 C. 5 D. 2 E. 4
If an ecosystem has a carrying capacity of 1,000 individuals for a given species and 2,000 individuals of that species are present, we can predict that the population
A) size will remain at equilibrium. B) size will decrease. C) will show a clumped dispersion pattern. D) size will slowly increase.
Following the actions of interleukin-1, ________ activate the remainder of the immune system response.
A. T cells B. B cells C. natural killer cells D. helper T cells
The transpiration pull is due to the ________ that causes water to move up through the xylem that begins at the surface of mesophyll cells.
Fill in the blank(s) with the appropriate word(s).