Aphysical system is best characterized as a collection of:

energy that has distinct boundaries
energy that does work
matter that does work
matter that has distinct boundaries

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat

Which worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm