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.

a physical change is being made.

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the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.