Why do humans compete for territory?

Which of the following statements about wearher along mountain ranges is correct

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

Which is not part of the definition of a family? two or more related people living together being married or in a partnership a single person living alone choices a and b