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.

The diagram below represents a marine food web and a process that can harm the human population. each circle represents an organism and the smaller dots inside them represent a toxic substance. what is being represented and how does it harm the population? the diagram represents biological half-life, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents biomagnification, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents the process by which different organisms prey upon each other; this can impact the human population by reducing the number of organisms that do not contain the toxin. the diagram represents the way that toxins are metabolized by living organisms, with those at greater trophic levels able to metabolize more efficiently than those at lower levels. this means that those at higher tropic levels are safer for humans to consume compared to the organisms at lower trophic levels.

The response is the basis for vaccination. primary secondary tertiary none of the above

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed