The main effect of burning peat, wood, coal, and petroleum on the Earth's climate is
A. the fires release back into the atmosphere carbon dioxide that was once taken from the atmosphere by plants and stored in their own tissues; the increased carbon dioxide holds in solar heat and causes a rise in temperature.
B. the rising heat from fires produces wind that cools the surface of the Earth.
C. the fires significantly heat the air and cause a rise in global temperature.
D. the smoke blocks sunlight from reaching the Earth and causes a significant lowering of the Earth's temperature.
E. the fires use up oxygen that would otherwise block penetration of ultraviolet light from reaching the Earth; the increased ultraviolet radiation heats the Earth.
Answer: A
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Which one of the following is never found in prokaryotic cells?
A) flagella B) capsule C) cilia D) ribosomes
Diploid cells ____________________
a. have a complete set of homologous chromosomes b. do not have homologous chromosomes c. have 48 chromosomes d. undergo crossing over of homologous chromosomes during mitosis
During inhalation, air flows into the lungs because
A. the surfactant in the lungs "draws" in air because of its adhesive properties. B. air pressure is greater outside the body than in the lungs and naturally flows inside once the chest has expanded. C. the strong chest muscles are sucking in air. D. air moves passively in and out of the lungs through time.
The knot of capillaries in a nephron, where filtration of blood occurs, is the:
A) proximal tubule. B) collecting duct. C) bowman's capsule. D) distal tubule. E) glomerulus.