Cutting down large areas of tropical rain forest increases atmospheric CO2 in two ways. One is that rotting and burning trees directly add CO2 to the atmosphere. What is the other reason CO2 increases?
Ans: The trees that would normally take up and use the CO2 are no longer there, which leaves excess CO2 unabsorbed.
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Due to biological magnification, which of the
following have the highest concentration of a chemical herbicide?
a. grass- the dominant primary producer b. cow- an herbivore c. grasshoppers - an herbivore d. mice - predators of butterflies e. hawk - predators of mice
__________ attach a gametophyte to soil or another surface. Fill in the blank(s) with the appropriate word(s)
Which one of the following statements is TRUE regarding chemotherapy?
A) This technique is used in the diagnosis of cancer. B) This procedure kills cancer cells and normal cells that divide rapidly. C) This is the selected technique in the treatment of cancer because there are no side effects. D) This is a procedure used to genetically engineer an individual so cancer will not develop. E) Most chemicals used in this procedure affect only one organ of the body.
Mutant versions of genes that are normally involved in promoting the development of cancer are known as ________
A) oncogenes B) attenuators C) tumor suppressors D) proto-oncogenes E) malignant genes