What is a major role that fungi play in ecosystems?
A. Recycling nutrients from dead organisms back into the food chain
B. Synthesizing glucose from carbon dioxide and water
C. Fixing carbon from the atmosphere
D. Decontaminating wastewater
Answer: A
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What percent of Earth is dry land?
a. 10 percent b. 25 percent c. 30 percent d. 45 percent e. 50 percent
Which amoung these explains the relationship between the magnification of the lens and working distance of a microscope?
A. As the magnification of the lens increases, working distance decreases. B.As the magnification of the lens increases, working distance increases. C.As the magnification of the lens decreases, working distance decreases. D. They are not related to each other
Carbon dioxide levels in the blood and cerebrospinal fluid affect pH. This enables the organism to sense a disturbance in gas levels as _____
A) the brain directly measures and monitors oxygen levels and causes breathing changes accordingly B) the medulla oblongata, which is in contact with cerebrospinal fluid, monitors pH and uses this measure to control breathing C) the brain alters the pH of the cerebrospinal fluid to force the animal to retain more or less carbon dioxide D) stretch receptors in the lungs cause the medulla oblongata to speed up or slow breathing
Mutation in a B group gene in Arabidopsis thaliana affects development in its flower's
a. first whorl only. b. second whorl only. c. third whorl only. d. first and second whorls. e. second and third whorls.