Renewable resources
can be replenished over months, years, or decades
are all living resources
have finite supplies that will one day be used up
include iron, natural gas, and copper

Works together in the synthesis, modification, packaging, and transport of lipids and proteins

Which best describes carbon dioxide’s path out of the body

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.