Which of the following are problems associated with intensive irrigation? I) mineral runoff II) over fertilization III) aquifer depletion IV) soil salinization

A) only I and II
B) only I, III, and IV
C) only III and IV
D) I, II, III, and IV


B

Biology & Microbiology

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An atom that is negatively charged because it has accepted an electron is a(n):

A. isotope. B. isomer. C. ion. D. monomer.

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Zoologists have described nearly ____ living species of animals

a. 20,000 b. 2 million c. 47,000 d. 100,000 e. 1 million

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In skeletal muscle contraction, which of the following must be moved to the grooves in the actin

double helix to uncover the crossbridge binding site?

a. troponin b. Ca2+ c. tropomyosin d. ATP e. acetylcholine

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What class of sensory receptors directly affects the activity of the cardiac center in the medulla oblongata? 

A. sensory cells in the juxtaglomerular apparati of the kidneys B. blood glucose sensors in the pancreas C. blood pH chemoreceptors in the aortic and carotid bodies D. baroreceptors in the arch of the aorta and in the carotid arteries E. osmoreceptors in the hypothalamus

Biology & Microbiology