The primary nitrogenous waste excreted by birds is _____
A) ammonia
B) nitrate
C) nitrite
D) urea
E) uric acid
Answer: E
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Which of the following groups of land plants appeared in the fossil record most recently?
A. mosses B. horsetails C. ferns D. gymnosperms E. angiosperms
A solution that has a higher concentration of dissolved materials than the solution it is compared to is
A. hypertonic. B. hypotonic. C. hydrophobic. D. hydrophilic.
Briefly describe how a seed develops from the ovule
What will be an ideal response?
Please match the virulence factor of Streptococcus pyogenes to its description.
Streptolysin A) Surface antigen that serves as the basis for alphabetical grouping; protects bacterium from lysozyme B) Toxin that causes beta-hemolysis on blood agar and injures cells of the host C) Enzyme that plays a role in invasion by leading to the digestion of fibrin clots D) Projecting surface antigen that facilitates adherence and resists phagocytosis E) Chemical surface layer that prevents an immune response by the host F) Enzyme that promotes invasion into tissues by breaking down the binding substance in connective tissues