The graph shows how the pesticide concentration in the tissues of birds of prey affects the pesticide concentration in their eggs and the average eggshell thickness - Scottish Highers Biology - Question 21 - 2023

To estimate the pesticide concentration in eggs at a tissue concentration of 12 parts per million, we first observe the graph. The trend shows that as the pesticide concentration in the tissues increases, the pesticide concentration in the eggs also increases. By extending the trend shown in the graph, we can predict the concentration at 12 parts per million.

From the observed data points, when the tissue concentration is at 10 parts per million, the pesticide concentration in eggs is at approximately 300 parts per million. Based on the trend, we can extrapolate that at 12 parts per million, the concentration in eggs would be even higher, potentially at 350 parts per million.

Thus, the predicted pesticide concentration in eggs is likely to be D 350 parts per million.