A healthy immune system destroys cancer cells with
A) tumor-specific antigens.
B) CTLs.
C) CTLs and activated macrophages.
D) activated macrophages.
E) CD+ T cells.
C
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Examine the digestive system structures in the figure above. The agents that help emulsify fats are produced in location _____
A) 1 B) 2 C) 3 D) 8 E) 9
All terrestrial ammonia-oxidizing bacteria are ?-proteobacteria, including Nitrosomonas and Nitrosospira in the Nitrosomonadaceae family.
Answer the following statement true (T) or false (F)
Dispersion is
A. the ability to move. B. the rate of movement. C. the spatial distribution of reproduction. D. the spatial distribution of individuals. E. the timing of reproduction.
The veins of leaves are used for
a. support. b. identification. c. transport of water and nutrients. d. detachment in the autumn. e. all of these.