Happy easter for a little surprise answer this simple question When was easter first celebrated and why

The earliest known Easter celebration took place during the second century. It is a Christian holiday meant to commemorate the Resurrection of Christ.

Easter was first celebrated 3 days after Jesus' burial, Jesus ressurected after his death (because of his crusification) and it needed to be celebrated so now we have Easter

a. competition with other nations.

genetics is the study of how dna works, the methodologies defining the new recent technologies allow scientist to have a panoramic view of the entire dna landscape, especially how genomes interact with their environment, including off course, factors outside their organisms.

thus is very possible the existence of both scenarios, where populations of isolated individuals have different genetic traits, and share traits related to genetic mutation, due rats can easily travel overseas using human transport channels. so scientists could get a vast number of data, including human interaction, evolution of rodents, health development, spread of infections, development of new organisms, how genomes evolve in different environments and so on.