Trace the path of a red blood cell from the left ventricle through the body, and back to the left ventricle.
What will be an ideal response?
Answer: Left ventricle-aorta-to tissues-veins-vena cava-right atria-right ventricle-pulmonary artery-lungs-pulmonary vein-left atria-left ventricle.
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The most common etiologic agent of lower respiratory tract infection among adults younger than 30 years of age is:
a. Chlamydophila pneumoniae. b. Mycoplasma pneumoniae. c. Streptococcus pneumoniae. d. Haemophilus influenzae.
How does phosphorus enter the biological portion of the cycle?
a. Land plants take up dissolved phosphate from the soil water. b. Bacteria fix phosphate from the atmosphere. c. Consumers eat phosphate containing soil. d. Bacteria fix phosphate from water. e. Erosion of rocks moves phosphate into water, which consumers drink.
Herbivores are indicated by
a. A. b. B. c. C. d. D. e. E.
How do hypotheses differ from theories?
A) Theories are more comprehensive than hypotheses. B) Theories must be testable; hypotheses do not need to be testable. C) Hypotheses are educated guesses, and theories are tentative explanations. D) Hypotheses are derived from experimentation, whereas theories are derived from observation.