Which of the following is the most likely impact of animals overgrazing on a patch of land a: fertility of soil will increase b: soil erosion will increase c: human population in the area will rise d: animal population in the area will rise

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks