After a new library opens in the community guests borrow almost all of the books within the first week. The manager of the library did not anticipate such interest so she now places a limit of two books on loans so that more people will have access to them. In this case the books in the library are serving as a .

Which is an advantage to using nonrenewable resources? a. they can be cheaper. b.they can have a lower impact on the environment. c.they can be used up rapidly. d.they can contribute to global warming.

What percentage of the earth's water is available for use by living things?

Nathan is an ecologist. he’s studying the effect of secondary consumers on primary consumers. his current research focuses on a population of blue jays and crows. they eat caterpillars and mice. if the number of blue jays increases, what are the likely effects on other populations? 1the number of crows will increase. 2the number of mice will decrease. 3the number of mice will remain the same. 4the number of caterpillars will decrease.