Page 1:Page 2: A line graph titled Total Immigrants by Decade shows years on the x-axis and number of immigrants on the y-axis. The x-axis is labeled 1820 to 2000. The y-axis is labeled 2,000,000 to 12,000,000. Immigration increases each year until 1930 through 1940. The highest amounts of immigration occurred in 1900, 1990, and 2000. Study the graphs, then select the best answers from the drop-down menus. The greatest number of people immigrated during the . During the Progressive Era, most immigrants came from . During the , there was a peak of about 800,000 immigrants coming to the United States.

answers are:

lysogenic     viral dna merges with host cell dna

lysogenic     no symptoms

lytic               viral dna takes over

lysogenic     virus does not destroy host cell

lytic               virus destroys host cell

lytic               induces symptoms of viral infection

lysogenic       cell reproduces and spreads provirus

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.