Why is Mecca Islam’s holiest city? What is expected of all Muslims at some point during their lifetime

Which of the following emerging technologies uses the principle of chromosomes to identify suspects

Compare demographic and environmental effects of the columbian

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