Toxicants that cause harm by affecting the immune system include ________
A) teratogens B) allergens C) neurotoxins D) antibiotics E) hormones
B
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When Nellie is suspended at rest by a pair of gymnastic rings, the upward support forces by the rings will always
A. each be equal to her weight. B. add up to more than her weight. C. each be half her weight. D. add up to equal her weight.
The swelling behavior of highly expansive soils can be decreased by treating the soil with:
a. sodium b. potassium c. calcium d. chloride
The overlapping area between two major plant-dominated ecosystems is a(n) ____
a. ecotone where elements of both ecosystems intermingle b. corridor separating the two ecosystems c. patch with elements of both ecosystems d. region with negative ecological optimum
What is an excellent example of an exotic stream?
a. Danube River b. Rhine Rive c. Thames River d. Nile River