The basic rule for air is A) warm air rises and cold air sinks. B) warm air sink and cold air rises. C) warm and cold air sink. D) warm air is heavy.

Which of the following is true about fossils? a. the relative age of fossils cannot be determined from their position in sedimentary layers. b. fossils found in lower layers of sedimentary rock are as old as fossils found in upper layers of sedimentary rock. c. fossils found in upper layers of sedimentary rock are older than fossils found in lower layers of sedimentary rock. d. fossils found in lower layers of sedimentary rock are older than fossils found in upper layers of sedimentary rock.

In a economy individuals answer the three basic and the central authority or leaders have little say in the economy.

What type of government does costa rica have?