15. How did DDT unexpectedly impact the food chain? (1 point)
A. • DDT was directly toxic to humans
B. • DDT killed too many insects
C. • DDT interfered with bird reproduction by weakening their egg shells
D. • DDT caused birth defects in mice
A. • DDT was directly toxic to humans
B. • DDT killed too many insects
C. • DDT interfered with bird reproduction by weakening their egg shells
D. • DDT caused birth defects in mice