PLEASE HELP, will mark brainlest, to who answers with the correct answer What is some BIOLOGICAL EVENTS.

A bioevent or bio-event (a shortening of 'biotic event' or 'biological event') is an event recognised in a sequence of sedimentary rocks, where there is a significant change in the biota as recorded by assemblages of fossils over a relatively short period of time.

Explanation:

1.According to Greek legend the war between the Greeks and the people of Troy was a long and bloody one.  And at the center was Helen, the most beautiful woman in all of Greece. And Paris, the Trojan prince who loved her.  PLZ HELP ME THIS IS A GRADE!!  

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this