One challenge faced by people living in mexico’s heartland region is

How did geographic isolation affect the islands in the australasia ecozobne?

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.

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