Explain how stars and constellations can serve as landmarks for other stars and constellations

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box

How water is moving through the ecosystem ?

Rarefaction is used for which of the following? a. creating a representative sample b. studying how disease impacts populations c. rediscovering species thought to be instinct d. determining which sea creatures live in an area