Practices such as no-till agriculture may help mitigate against soil erosion
Indicate whether the statement is true or false
TRUE
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Which type of drainage pattern is shown in Figure 24.5? Briefly describe the structural conditions that have created this pattern.
What will be an ideal response?
Humans have dramatically altered the rate of nitrogen fixation into forms usable by autotrophs ________
A) by producing synthetic fertilizers and applying them to crops, lawns, and parks B) due to the burning of fossil fuels to meet our energy needs C) because of the erosion of farmlands through poor agricultural practices D) by using antibiotics to reduce the numbers of denitrifying bacteria E) by selectively removing leguminous plants
Which compound does not serve as a pigment in phytoplankton?
A. phycoerythrin B. chlorophyll c C. hemoglobin D. chlorophyll a E. fucoxanthin
What is an example of an energy source that is renewable and has less environmental impact than fossil fuels?
A. bioenergy B. natural gas C. crude oil D. coal