Which of these statements is the best reason for countries to work together to address environmental issues? a. international treaties are largely ineffective because developing countries lack the resources to enforce them. b. pollution made in one country might contaminate the ground, water, and air of other countries c. pollution made in one country trends to stay in that country and harm only that country's residents d. environmental damage is caused mainly by developing countries that need to work together.

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)