Goiter is a disease characterized by an enlarged thyroid gland. Which of the following either leads to or is an outcome of the disease?
A. iodine deficiency in the diet
B. reduced levels of T3 in the blood
C. reduced levels of T4 in the blood
D. excessive thyroid-stimulating hormone production
E. All of the choices are correct.
E. All of the choices are correct.
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With regard to the destruction of tropical forests, the focus is often on biodiversity and the impact to these ecosystems. What is a direct benefit to humans that helps explain why these forests need to be preserved?
A) This diversity could contain undocumented insect species. B) Natural and undisturbed areas are important wildlife habitats. C) The diversity could contain novel drugs for consumers. D) The plant diversity provides shade, which lowers global warming.
Why is a drop in blood pressure potentially dangerous?
A. Once pressure drops, it can take hours to increase it again. B. Low blood pressure leads to gas bubbles in the blood that can cause a stroke or the "bends". C. If pressure is not high enough, blood vessels collapse and can become stuck closed. D. Active cells, like those in the brain, need a continuous supply of oxygen and nutrients.
The state of torpor caused by lack of food or water during periods of high temperature is called:a
acclimatization. b. hibernation. c. conformation. d. estivation. e. migration
Which of the following groups is most likely the closest relative of seed plants?
a. Charophytes b. Monilophytes c. Hornworts d. Lycophytes e. Mosses