Identify and describe three beneficial impacts of fire on certain ecosystems. What will be an ideal response?
Fire frees the minerals locked in organic matter, thus making those minerals available to other
organisms.
Fire removes plant cover and exposes the soil, thus stimulating seed germination and the growth of
shade-intolerant plants.
Fire removes deadwood and other plant litter, thus preventing more destructive fires from occurring at
a later time
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Determine the rate of diffusion in the gas-exchange organ of an air-breathing animal where the area for gas exchange in the lung is 200 mm2,
the diffusion constant is 0.08, the (partial pressure of oxygen) of the air in the lung is 140 mm Hg, the in blood flowing into the lung is 90 mmHg, and the thickness of the gas exchange membrane is 0.001 mm. A) 800,000 B) 125 C) 00032 D) 10,000,000
Which of the following is part of the urinary system,
not the reproductive system? a. ureter b. urethra c. vas deferens d. vas efferens e. epididymis
Which statement is true about the removal of a terminal phosphate from ATP?
A.) the reaction is energetically favorable B.) the reaction is associated with a positive change in delta G C.) the reaction is a condensation reaction
Which reaction has X and Y as reactants?
A) X + YZ ? Y + XZ B) XY + W ? WY + X C) XY ? X + Y D) X + Y ? XY E) XY + AB ? XB + AY