Among humans, sexual maturity occurs _______________
a. after puberty
b. at adulthood
c. when the sexual organs start to develop
d. when the sex hormones are produced
A
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Darwin's book in which he described his views on evolution is:
A. Principles of Geology. B. Survival of the Fittest. C. On the Origin of Species. D. On the Principle of Population.
Activated sludge is used in which sewage treatment step?
A. Secondary B. Tertiary C. Primary D. All of these choices are correct.
What are vascular bundles that are strengthened with sclerenchyma fibers called in leaves?
a. veins b. vessels c. xylem d. phloem e. sclerenchyma
Humoral immunity involves ________, while ________ function in cell-mediated immunity.
A. monocytes; basophils B. B cells; T cells C. basophils; T cells D. B cells; neutrophils E. T cells; B cells