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Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

Some substances but not other can cross the (blank) membrane of a cell