Psilotum lacks
(a) roots.
(b) a mechanism to take up water and minerals.
(c) vascular tissue.
(d) alternation of generations.
(a) roots.
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A classification system based on evolutionary relationships is called a ________ system.
A. determinative B. systematic C. phylogenetic D. phenetic
This protein functions in muscle contraction.
a. Keratin b. Hemoglobin c. Actin d. Insulin e. Pepsin
The primary cause of the current increase in levels of atmospheric CO2 is the burning of ________ by humans
Fill in the blank(s) with correct word
A new vaccine for the upcoming flu season is developed from an influenza isolate designated A/Shanghai/2/2013(H7N9). This nomenclature means the isolate is
A) a type A with antigens HA 7 and NA 9 isolated in Shanghai in February 2013. B) a type A with 7 HA antigens and 9 NA antigens isolated in Shanghai in February 2013. C) the second type A strain with HA 7 and NA 9 antigens isolated in Shanghai in 2013. D) a type B strain with antigens HA 7 and NA 9, first isolated in February 2013. E) a hybrid of 2 type As combining 7 HA and 9 NA antigens, created in February 2013.