Read the following selection from the article. As life expands into its environment, it uses up sources of energy and matter. It also expels waste products, and these environmental changes lead to more evolution. Explorers should watch for this cyclical process. What does the word "cyclical" in the selection tell the reader? A The process is easy to control. B The process is always expanding. с The process requires a lot of energy. D The process repeats again and again. Bho Next​

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)