In 1942 scientists came out with ddt, a miracle insecticide, able to kill most bugs on contact. just before this the u. s. government placed the bald eagle under protection in an attempt to stop the killing of our national bird. by the mid 1960's it was apparent that something was wrong because the eagle population had declined so much it needed to be placed on the endangered species list. scientists and environmentalists began investigating and it was concluded that ddt was one of the main culprits. in 1972, ddt was banned from use because of its effects as a pollutant. the graph shows the how many nests hold a specific number of eggs. usually eagles average two eggs per nest. what can be concluded from these data? a. the banning of ddt in 1972 caused a decline in the number of eggs laid by eagles. b. eagles migrating from new york to canada are heartier than eagles migrating from arizona to oregon. c. the bald eagle population increased by 10% this year compared to last year. d. the number of nesting pairs of eagles increased to 50 pairs this year.