Which example describes migration caused by overcrowding?

Migration because of congestion. It is to some degree deluding, as the absence of room has never been a basic issue on a huge scale. considerably more predominant has been deficiencies of nourishment or other basic assets, which are the main driver of numerous relocations, for example, amid the Irish Potato Famine which made many escape from Ireland to the United States because of the Starvation and destroyed economy in Ireland at the time.

A) 4 amusingb)alpha particle is a helium nucleus. it contains 2 protons and 2 neutrons.c)alpha particle has charge of +2.