What is the problem that donald sadoway is trying to resolve

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone