How are countries in the european union linked. check all that apply.
A. their inhabitants all speak the same language
B. they share a common currency
C. they all have a similar climate
D. they form a single economy

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