The pesticide DDT proved harmful to predatory birds because it O a. caused thinning of the birds' eggshells
O b. caused mutations in the birds' offspring
O c. killed the birds when they ate it
O d. killed animals the birds preyed upon
O e. allowed invasive species to spread

Which pair of sentences is describing the same velocity? a. a car is parked. a car is moving in circles. b. a bus drives 40 miles per hour north. a truck drives 50 miles per hour north. c. a boy walks east at 6 kilometers per hour. a girl walks west at the same speed as the boy. d. valerie rides her bike south at 8 kilometers per hour. owen jogs south at 8 kilometers per hour.